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KCET2009PhysicsThermal Properties of Matter

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

Options

  1. AThe wavelength changes when it travels from one medium to another
  2. BThe frequency changes when it travels from one medium to another
  3. CThe speed changes when it travels from one medium to another
  4. DThey travel in straight line in a given medium

Correct answer

B. The frequency changes when it travels from one medium to another

Step-by-step 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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