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Mechanical Engineering · Q118

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 118

Q118

The value of the wavelength for maximum emissive power is given by

A.
Wien’s law
Answer
B.
Planck's law
C.
Stefan's law
D.
Fourier's law

Answer: Option A

Solution

Answer: Option A
Solution:
When the temperature of a blackbody radiator increases, the overall radiated energy increases and the peak of the radiation curve moves to shorter wavelengths. When the maximum is evaluated from the Planck radiation formula, the product of the peak wavelength and the temperature is found to be a constant.
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