Transmission Of Heat Question 163
Question: Which of the following statement is correct
[RPMT 2001]
Options:
A) A good absorber is a bad emitter
B) Everybody absorbs and emits radiations at every temperature
C) The energy of radiations emitted from a black body is same for all wavelengths
D) The law showing the relation of temperatures with the wavelength of maximum emission from an ideal black body is Plank’s law
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Answer:
Correct Answer: D
Solution:
A good absorber is a good emitter hence option (a) is wrong. Every body stops absorbing and emitting radiation at 0 K hence option (b) is wrong. The energy of radiation emitted from a black body is not same for all wavelength hence option (c) is wrong. Plank’s law relates the wavelength (l) and temperature (T) according to the relation $ {E _{\lambda }}{d _{\lambda }}=\frac{8\pi ,hc}{{{\lambda }^{5}}}\frac{1}{[{{e}^{hc/kT}}-1]}{d _{\lambda }} $ . Hence option (d) is correct.
BETA
