Which of the following statement does not hold good for thermal radiation?
Show Hint
- The wavelength changes when it travels from one medium to another
- The frequency changes when it travels from one medium to another
- The speed changes when it travels from one medium to another
- They travel in straight line in a given medium
The Correct Option is B
Solution and Explanation
Thermal radiation is an electromagnetic wave and follows the same rules as light.
Step 2: Medium Change
When a wave enters a new medium, its speed and wavelength change based on the refractive index.
Step 3: Invariant Property
The frequency of a wave is determined by the source and remains constant regardless of the medium.
Final Answer: (b)
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