Objects at different temperatures

Lab 9 Notes and Lab Questions
For Lab 9, you won’t be doing anything out of the lab manual. (We’re skipping Lab 9, which requires a lot of in-person equipment). Instead, you’ll be using a simulation that shows the color and amount of light produced by objects at different temperatures (https://phet.colorado.edu/sims/html/blackbody-spectrum/latest/blackbody-spectrum_en.html ). The simulation can also be used to find the total energy produced by each object, if you know how big the object is.
You can do this lab on your own if you want, or you can choose to attend the online session on blackboard (Tu 9-11 or 11-1 on Apr 13th) for help. The youtube walkthrough will be posted on Wednesday here: https://www.youtube.com/playlist?list=PLqXGExy61NILKxSOpnD51PTf-8yYFxWvp
Part 1: Colors
All objects make their own light, even if that light isn’t visible to us. If an object is hotter, it produces higher energy kinds of light. In this part, you’ll learn how to use the simulation to determine what kinds of light is being made by objects at different temperatures. As usual, answer the number questions below as your lab data. Since there is no lab manual for this lab, just answer the questions and show your work in a document.
Follow the link to the simulation.
The graph in front of you shows the total amount of light produced by an object of a certain temperature. When you first load the simulation, it is set up to measure the light from the Sun.
1. Record the temperature of the Sun. Use google to convert the K temperature of the Sun into whichever temperature system you’re more familiar with (F or C). (Type “5800 K to F” or “to C”, depending)
The graph on the left shows the amount of light given off by the Sun (or any other object at 5800 K). The kinds of light are shown horizontally: click “labels” to see the names of the different kinds of light shown. The higher the curve is at a certain color or type of light, the more light is produced by the Sun of that color or type. We’ll use the specific colors when talking about the visual rainbow; use UV and IR to talk about ultraviolet or infrared light.
2. What color or type of light does the Sun make the most of?
Besides all of the colors of the rainbow, which we can see, the Sun also makes UV and IR light, which our eyes cannot see.
3. Does the Sun make more IR or UV? (Hint: compare how much of the Sun’s light curve is on the UV side vs the IR side.)
Our eyes don’t see the individual colors separately when we look at a bright object; instead, we see the combination of all of them together. The star shape at the top shows the rough color that we see from the Sun when all that light is combined.
4. What color do we see with our eyes from the Sun? Bright blue / red / green? Something else?
By dragging the triangle up and down on the thermometer, you can change the temperature of the object you’re looking at. This will sometimes make the graph too tall or short to see, so you’ll need to use the zoom buttons on the x- and y-axes to center the graph again.
First, we’ll look at Sirius A, a star that is hotter than the Sun. It is the brightest star in the sky. Turn the temperature up until it matches Sirius A.
5. Record the temperature of Sirius A. How hot is it in F or C (whichever you choose)?
The graph is should be off the top of the graph. Experiment with the plus / minus zoom buttons on the TOP of the graph: these affect the vertical zoom. (The buttons on the bottom adjust the horizontal zoom, which we’ll need later on) Adjust them until you can see the peak of the orange line again.
6. What colors and types of light does Sirius A make? What color or type of light does it make the most of? What color will we see when we look at Sirius A with our eyes?
Now adjust the temperature to match a light bulb.
7. Record the temperature of the light bulb. How hot is it in F or C?
Because the light bulb is much cooler than the Sun or Sirius A, you’ll need to adjust the zoom at the top again to see its light curve. Adjust until you can see the curve clearly.
8. What colors and types of light does the bulb make? What color or type of light does it make the most of? What color will we see when we look at the bulb with our eyes?
Now switch over to the temperature of the Earth. Because the earth is so much colder than the other objects, you’ll have to adjust both vertical AND horizontal zoom until the light curve is on the graph.
9. Record the temperature of the Earth. How hot is it in F or C?
10. The Earth only makes one kind of light. Which kind? Is it a kind we can see with our eyes?
Notice that the bright star that showed you the color of other objects is now gone: our eyes don’t see any light that is produced by the Earth.
11. About how hot would an object have to be to make more purple than any other color of light?
In the sky, there are no stars that look green to us.
12. Experiment with the temperature gauge. What are the possible star colors that we can see with our eyes?
Part 2: Calculating the luminosity
The total energy that is produced by the light coming from an object every second (its luminosity) depends on both its temperature and how big the object is. In this section, you’ll calculate the energy produced by each object every second.
Click on the intensity box. This expresses a number with the units “W/m2”. A Watt (“W”) is how much light energy the object gives off every second. This number is divided by “m2”; if you multiply the number you see by the area of the object in meters squared, you can get the total energy it releases in light every second.
On the graph, the area under the orange curve has been highlighted. The number in the intensity box represents the total energy produced by combining all of the kinds of light that each object makes.
To figure out how much energy the Earth makes, we need the surface area of the Earth. The Earth is a sphere, so the surface area of the Earth is given by:
Surface Area of a sphere = 4πR2
13. Look up the radius of the Earth in meters. Record that number.
14. Using a calculator or google, calculate the Surface area of the Earth. (This will be shown in detail in the lab video)
To get the total amount of light energy given off by the Earth each second, multiply your area number by the intensity number recorded on screen. Make sure to include the scientific notion part: the 10x power at the end of the number. If you’re not sure how to deal with this, follow the instructions in the lab video.
Luminosity = Surface area * Intensity
15. What is the luminosity of the Earth?
Notice that the Earth makes a lot of energy mostly because of its very large size.
Compare this to the energy produced by a light bulb. The actual piece of metal that glows to make the light in the bulb is very small: use 1.5 x 10-5 m2 for the area of the bulb.
16. How much light energy does the bulb produce each second? Is it more or less than the Earth? How close is it?
You can use the same technique you used with the Earth to figure out the total energy made by either of the two stars.
17. Pick either the Sun or Sirius A.
18. Look up the star’s radius in meters, and record it.
19. Calculate the area of the star, using the surface area of a sphere like for #13.
20. Record the intensity number of the star
21. Calculate the total energy made by the star every second, by multiplying the surface area by the intensity. Record your final answer as a number of Watts (W).
You can look up the luminosity of the star you chose; either the Sun or Sirius A. You’ll compare this number to the number you just calculated in the conclusion.
22. Look up the luminosity in Watts of the star you chose, and record it. .
Lab Questions for Lab 9
• Purpose (what is the point of the lab? Why did you do what you did?
• Ideas (explain the given idea; and one more that you pick)
• An observation you made in looking at the colors and types of light in Part 1.
• An observation you made while calculating total energy in Part 2.
• Conclusion (answer these questions in sentences. Use your lab data to support your answers)
-Compare the colors you found for the four objects in Part 1. How were the colors of light affected by the temperature of the object? How were the colors that we see with our eyes affected by the temperature of the object? Describe some of the details.
-How does the luminosity you calculated for your star compare to the number you looked up? From your perspective, did the equations you used work well? Explain.

Get Professional Assignment Help Cheaply

Buy Custom Essay

Don't use plagiarized sources. Get Your Custom Essay on
Objects at different temperatures
Just from $9/Page
Order Essay

Are you busy and do not have time to handle your assignment? Are you scared that your paper will not make the grade? Do you have responsibilities that may hinder you from turning in your assignment on time? Are you tired and can barely handle your assignment? Are your grades inconsistent?

Whichever your reason is, it is valid! You can get professional academic help from our service at affordable rates. We have a team of professional academic writers who can handle all your assignments.

Why Choose Our Academic Writing Service?

  • Plagiarism free papers
  • Timely delivery
  • Any deadline
  • Skilled, Experienced Native English Writers
  • Subject-relevant academic writer
  • Adherence to paper instructions
  • Ability to tackle bulk assignments
  • Reasonable prices
  • 24/7 Customer Support
  • Get superb grades consistently

Online Academic Help With Different Subjects


Students barely have time to read. We got you! Have your literature essay or book review written without having the hassle of reading the book. You can get your literature paper custom-written for you by our literature specialists.


Do you struggle with finance? No need to torture yourself if finance is not your cup of tea. You can order your finance paper from our academic writing service and get 100% original work from competent finance experts.

Computer science

Computer science is a tough subject. Fortunately, our computer science experts are up to the match. No need to stress and have sleepless nights. Our academic writers will tackle all your computer science assignments and deliver them on time. Let us handle all your python, java, ruby, JavaScript, php , C+ assignments!


While psychology may be an interesting subject, you may lack sufficient time to handle your assignments. Don’t despair; by using our academic writing service, you can be assured of perfect grades. Moreover, your grades will be consistent.


Engineering is quite a demanding subject. Students face a lot of pressure and barely have enough time to do what they love to do. Our academic writing service got you covered! Our engineering specialists follow the paper instructions and ensure timely delivery of the paper.


In the nursing course, you may have difficulties with literature reviews, annotated bibliographies, critical essays, and other assignments. Our nursing assignment writers will offer you professional nursing paper help at low prices.


Truth be told, sociology papers can be quite exhausting. Our academic writing service relieves you of fatigue, pressure, and stress. You can relax and have peace of mind as our academic writers handle your sociology assignment.


We take pride in having some of the best business writers in the industry. Our business writers have a lot of experience in the field. They are reliable, and you can be assured of a high-grade paper. They are able to handle business papers of any subject, length, deadline, and difficulty!


We boast of having some of the most experienced statistics experts in the industry. Our statistics experts have diverse skills, expertise, and knowledge to handle any kind of assignment. They have access to all kinds of software to get your assignment done.


Writing a law essay may prove to be an insurmountable obstacle, especially when you need to know the peculiarities of the legislative framework. Take advantage of our top-notch law specialists and get superb grades and 100% satisfaction.

What discipline/subjects do you deal in?

We have highlighted some of the most popular subjects we handle above. Those are just a tip of the iceberg. We deal in all academic disciplines since our writers are as diverse. They have been drawn from across all disciplines, and orders are assigned to those writers believed to be the best in the field. In a nutshell, there is no task we cannot handle; all you need to do is place your order with us. As long as your instructions are clear, just trust we shall deliver irrespective of the discipline.

Are your writers competent enough to handle my paper?

Our essay writers are graduates with bachelor's, masters, Ph.D., and doctorate degrees in various subjects. The minimum requirement to be an essay writer with our essay writing service is to have a college degree. All our academic writers have a minimum of two years of academic writing. We have a stringent recruitment process to ensure that we get only the most competent essay writers in the industry. We also ensure that the writers are handsomely compensated for their value. The majority of our writers are native English speakers. As such, the fluency of language and grammar is impeccable.

What if I don’t like the paper?

There is a very low likelihood that you won’t like the paper.

Reasons being:

  • When assigning your order, we match the paper’s discipline with the writer’s field/specialization. Since all our writers are graduates, we match the paper’s subject with the field the writer studied. For instance, if it’s a nursing paper, only a nursing graduate and writer will handle it. Furthermore, all our writers have academic writing experience and top-notch research skills.
  • We have a quality assurance that reviews the paper before it gets to you. As such, we ensure that you get a paper that meets the required standard and will most definitely make the grade.

In the event that you don’t like your paper:

  • The writer will revise the paper up to your pleasing. You have unlimited revisions. You simply need to highlight what specifically you don’t like about the paper, and the writer will make the amendments. The paper will be revised until you are satisfied. Revisions are free of charge
  • We will have a different writer write the paper from scratch.
  • Last resort, if the above does not work, we will refund your money.

Will the professor find out I didn’t write the paper myself?

Not at all. All papers are written from scratch. There is no way your tutor or instructor will realize that you did not write the paper yourself. In fact, we recommend using our assignment help services for consistent results.

What if the paper is plagiarized?

We check all papers for plagiarism before we submit them. We use powerful plagiarism checking software such as SafeAssign, LopesWrite, and Turnitin. We also upload the plagiarism report so that you can review it. We understand that plagiarism is academic suicide. We would not take the risk of submitting plagiarized work and jeopardize your academic journey. Furthermore, we do not sell or use prewritten papers, and each paper is written from scratch.

When will I get my paper?

You determine when you get the paper by setting the deadline when placing the order. All papers are delivered within the deadline. We are well aware that we operate in a time-sensitive industry. As such, we have laid out strategies to ensure that the client receives the paper on time and they never miss the deadline. We understand that papers that are submitted late have some points deducted. We do not want you to miss any points due to late submission. We work on beating deadlines by huge margins in order to ensure that you have ample time to review the paper before you submit it.

Will anyone find out that I used your services?

We have a privacy and confidentiality policy that guides our work. We NEVER share any customer information with third parties. Noone will ever know that you used our assignment help services. It’s only between you and us. We are bound by our policies to protect the customer’s identity and information. All your information, such as your names, phone number, email, order information, and so on, are protected. We have robust security systems that ensure that your data is protected. Hacking our systems is close to impossible, and it has never happened.

How our Assignment Help Service Works

1. Place an order

You fill all the paper instructions in the order form. Make sure you include all the helpful materials so that our academic writers can deliver the perfect paper. It will also help to eliminate unnecessary revisions.

2. Pay for the order

Proceed to pay for the paper so that it can be assigned to one of our expert academic writers. The paper subject is matched with the writer’s area of specialization.

3. Track the progress

You communicate with the writer and know about the progress of the paper. The client can ask the writer for drafts of the paper. The client can upload extra material and include additional instructions from the lecturer. Receive a paper.

4. Download the paper

The paper is sent to your email and uploaded to your personal account. You also get a plagiarism report attached to your paper.

smile and order essay GET A PERFECT SCORE!!! smile and order essay Buy Custom Essay

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more
error: Content is protected !!
Open chat
Need assignment help? You can contact our live agent via WhatsApp using +1 718 717 2861

Feel free to ask questions, clarifications, or discounts available when placing an order.
  +1 718 717 2861           + 44 161 818 7126           [email protected]
  +1 718 717 2861         [email protected]