Multiple choice

The velocity of light in vaccum can be changed by changing

  1. frequency

  2. wavelenght

  3. amplitude

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The speed of light in vacuum is a fundamental constant c = 3 x 10^8 m/s. It does NOT depend on frequency, wavelength, or amplitude. The relationship c = f × λ means that if you change frequency, wavelength changes automatically to keep c constant. Only in a medium does the speed change, and that depends on the medium's properties, not the wave characteristics.

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