Home Physics Electromagnetic Wave Karnataka - CET Previous Years Question Which of the following statement does not ho…
Physics Electromagnetic Wave Karnataka - CET Previous Years Question MCQ (Single Correct)

Which of the following statement does not hold good for thermal radiation?

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.

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Text Solution

Verified by Experts
The correct answer is:
B

: Thermal radiation travels in straight lines, like light. Thermal radiation obeys the law of refraction. Hence, when it travels from one medium to another, its wavelength and speed changes whereas frequency remains unchanged as frequency is the characteristics of source of thermal radiation.

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