[Solved]     https://phet.colorado.edu/en/simulations/blackbody-spectrum... | CliffsNotes (2023)

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[Solved] https://phet.colorado.edu/en/simulations/blackbody-spectrum... | CliffsNotes (2)

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Blackbody RadiationAstronomy 110BackgroundHere you will investigate the properties of light from a source called a "blackbody". A blackbody is defined as any object that absorbs all light that hits it. Blackbody radiation refers to thespectrum of light that a blackbody emits. All solid bodies and dense liquids and gases emit ablackbody spectrum, so that includes stars, planets, dense gases in space, people, light bulbs, and so on.The electromagnetic energy absorbed by a blackbody is radiated back out at differentwavelengths. Using an on-line experiment, we will investigate the light emitted. By analyzing the lightproduced by a blackbody source we can determine a fundamental property of the source. In astronomythis is very powerful because we can never travel to the objects we can try to understand. We only canreceive the light they produce.Procedure1. Open the following link: https://phet.colorado.edu/en/simulation/blackbody-spectrum2. Click the "play" icon to open the simulation.3. A window will open similar to the one below. Notice there are two zoom button on the vertical axisintensity, and the same to buttons towards the right of the horizontal axis, wavelength:...

[Solved] https://phet.colorado.edu/en/simulations/blackbody-spectrum... | CliffsNotes (3)

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Clear-0100Sun5778-light bulbintensity(MW/m-/um)T(K)-oven-carth0wavelength (um)Ium = 1000 nmoomShow RulerObserve what happens to the scale and to the plot when you click on the-Obutton on the intensity axis?Observe what happens to the scale and to the plot when you click on thebutton on the intensity axis?Observe what happens to the scale and to the plot when you click on thebutton on the wavelength axis?+Observe what happens to the scale and to the plot when you click on thebutton on the wavelength axis?See whether the spectrum represented by the red curve change in value by any of these actions or not....

[Solved] https://phet.colorado.edu/en/simulations/blackbody-spectrum... | CliffsNotes (4)

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Slide the temperature button around in both up and down directions:5025T(K)Lower the temperature of the source and observe the change in color of the source as well as thechange in shape of the graph. See how the wavelength of the maximum intensity does change.Now, raise the temperature of the source and observe the change in color of the source as well as thechange in shape of the graph. See now how the wavelength of the maximum intensity does change.Notice how the red blackbody curve sometimes goes "through" the top of the window. Noticehow the curve sometimes is too low to be examined. When this happens, play with the zoom buttonsto re-adjust the scale so that you have the curve plotted within the boundaries of the axes....

(The emission of radiation/light by an object comes with many wavelengths of light, but the wavelength corresponding the peak of the radiation curve dominates over all the rest of wavelengths. In other words, the wavelength at which the spectrum peaks corresponds to the color produced most by the object.)]

1-What would be the (surface) temperature of an object glowing red?

Hint: Slide the temp button up & down (and zoom-in & -out as needed) and bring the peak of the blackbody curve to the middle point of the red band (the region colored with red within the rainbow).

2-What would be the (surface) temperature of an object glowing green?

Hint: Slide the temp button up & down (and zoom-in & -out as needed) and bring the peak of the blackbody curve to the middle point of the green band (the region colored with green within the rainbow).

3-Which of the following celestial objects produces no violet light?

Hint 1: Set the temperature to each object's temperature one by one (Earth = 250 K, Light Bulb = 3000 K, Sun = 5800 K and Sirius A = 9950 K), zoom-in & -out as needed to have the red curve within the boundaries of the axes, click on the 'Graph Values" botton upon seeing the red curve (almost) fully, drag the white dot popping up at the peak of the blackbody curve to the middle point of the violet band (i.e., at the 0.400 micro-meter wavelength) and read the spectral power density (vertical axis value). The one has the highest spectral power density produces the most violet light.

Hint 2: Hint 1 is the most precise way. You can answer the question by visually examing the curve while taking the actions described in Hint 1 (Visual approach does not need to read any vertical value).

A-Earth

B-Sun

C-Light Bulb

4-Find the product of the peak wavelength of Earth's spectrum and its temperature. (λpeak * T = ? for Earth)

(Round your answer to two decimal places. Do not enter a unit, just submit a number.)

5-Find the product of the peak wavelength of light bulb's spectrum and its temperature. (λpeak * T = ? for light bulb)

(Round your answer to two decimal places. Do not enter a unit, just submit a number.)

6-Find the product of the peak wavelength of Sun's spectrum and its temperature. (λpeak * T = ? for Sun)

(Round your answer to two decimal places. Do not enter a unit, just submit a number.)

7-Find the product of the peak wavelength of Sirius A's spectrum and its temperature. (λpeak * T = ? for Sirius A)

(Round your answer to two decimal places. Do not enter a unit, just submit a number.)

8-When you compare the products of the temperatures & peak wavelengths of the four objects (Earth, Sun, Light Bulb & Sirius A), what do you observe about all of these answers ?

Aλpeak * T remains pretty much the same for all four objects.
Bλpeak * T gives (very) different results for all four objects.

9-What is the average value of λpeak * T of the four objects (Earth, Sun, Light Bulb & Sirius A)?

Hint: Average = Sum of all four products / 4

(Round your answer to the nearest integer. Do not enter a unit, just submit a number.)

ScienceAstronomy

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