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Transmission of Heat — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsTransmission of Heat1 Mark
MCQ
Which of the following statement is correct
  • A
    A good absorber is a bad emitter
  • B
    Every body absorbs and emits radiations at every temperature
  • C
    The energy of radiations emitted from a black body is same for all wavelengths
  • ✓
    The law showing the relation of temperatures with the wavelength of maximum emission from an ideal black body is Plank's law
✓

Answer

Correct option: D.
The law showing the relation of temperatures with the wavelength of maximum emission from an ideal black body is Plank's law
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 $(\lambda)$ and temperature $(T)$
according totherelation $(E_\lambda d_\lambda=\frac{8 \pi h c}{\lambda^5} \frac{1}{\left[e^{h c / k T}-1\right]} d_\lambda$). Hence option (d) is correct.

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