Which of these is constant for ALL types of electromagnetic radiation in a vacuum?
A)amplitude
B)wavelength
C)frequency
D)velocity
E)photon energy

Question

Quizplus · Accepted Answer

The velocity of electromagnetic radiation in a vacuum is constant and equal to the speed of light (i.e. 2.998 x 10^8 m/s). This is unchanging regardless of the wavelength, frequency, amplitude, or photon energy of the radiation. The speed of light in a vacuum is always constant, regardless of the wavelength, frequency or amplitude of the electromagnetic radiation. This is a fundamental principle of physics known as the speed of light postulate.

Which of These Is Constant for ALL Types of Electromagnetic