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
Correct Answer: B
Solution :
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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