Amax T 2.89 x 106 nm K. Ma p da Our Sun has a surface temperature of 5800 K. Usi

Question

Amax T 2.89 x 106 nm K. Ma p da Our Sun has a surface temperature of 5800 K. Using the temperature meter in the PhET, click in the box with the numbers and type 5800 to view the spectrum for this temperature. Click the "show ruler" box in the lower left. Use the ruler as a guide and the scale on the horizontal axis to measure the peak wavelength. What do you find for the peak wavelength, in units of nanometers? Number nm Use Wien's displacement law to calculate the temperature (in Kelvin) of a blackbody with the peak wavelength that you measured in the previous part. Number In terms of colour range, which of the following best describes the peak of Sun's Blackbody Spectrum? O Violet- Blue O Blue - Green OGreen - Yellow O Yellow - Orange

Explanation / Answer

according to the Wein's displacement law

lambda. T = 2.89 x 10^-3 m K

lambda = 2.89 x 10^-3/T = 2.89 x 10^-3/5800 = 499.66 nm

Hence, lambda = 499.66 nm

using the same relation,

T = 2.89 x 10^-3/lambda = 5800 k

Hence, T = 5800 K

Correct Answer is

Violet-Blue

Since the wavelength 499 x 10^-9 is for violet-blue range.

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