Which one of the following properties of light does not change with the nature of the medium ?
Correct answer: D. frequency
- A. velocity
- B. wavelength
- C. amplitude
- D. frequency
Explanation
When light enters a different medium, its speed and wavelength change, but its frequency is fixed by the source and remains unchanged at the boundary. Option b is the likely choice for students who remember wavelength as a property of the source rather than using v = fλ.
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About Wave Speed
Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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