Monochromatic light enters from one medium to the other. Which one of the following properties does not change?
- AFrequency
- BAmplitude
- CVelocity
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (a) Frequency
Explanation
When light passes from one medium to another, its frequency does not change; it is set by the source. Its speed and wavelength change together (v = fλ).
Its amplitude can also change, as some light is reflected or absorbed at the boundary.