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Which one of the following statements is...

Which one of the following statements is not true about thermal radiations ?.

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

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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