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

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DukeTankButterfly16

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(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 ?

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.)

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