Which of the following statements about the electromagnetic waves is correct?
- radio waves have longer frequencies than x-rays
- x-rays have the longest wavelength
- some of the waves travel at 3.0 x 108ms-1
-
white light occupies a region beyond ultraviolet rays
The correct answer is: D
Explanation
All electromagnetic waves: are transverse waves; can travel through a vacuum ; travel at exactly the same speed in a vacuum, the speed of light, 300,000,000 m/s.
The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays.
ultraviolet rays lie beside violet of visible light and has a lesser frequency than visible light.