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Question: Answered & Verified by Expert
Which of the following statement does not hold good for thermal radiation?
PhysicsThermal Properties of MatterKCETKCET 2009
Options:
  • A The wavelength changes when it travels from one medium to another
  • B The frequency changes when it travels from one medium to another
  • C The speed changes when it travels from one medium to another
  • D They travel in straight line in a given medium
Solution:
1699 Upvotes Verified Answer
The correct answer is: The frequency changes when it travels from one medium to another
Thermal radiation obeys the law of refraction and it travels along straight line like light. Hence, frequency does not change when travelling from one medium to another.

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