Multiple choice

In vacuum what will be common among X - rays, visible light, radio waves and infra-red rays?

  1. Speed

  2. Frequency

  3. Wavelength

  4. Amplitude

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In vacuum, all electromagnetic waves travel at speed c (3×10^8 m/s) regardless of frequency or wavelength. Different types have different frequencies and wavelengths but identical speed in vacuum.