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 speed of light, which is the velocity of electromagnetic radiation, is constant in a vacuum according to Einstein's theory of relativity. This constant is approximately 299,792,458 meters per second (m/s) or 670,616,629 miles per hour (mph).

Answer A, B, C, and E are not constant for all types of electromagnetic radiation in a vacuum. The amplitude and wavelength can vary depending on the type of radiation, while the frequency and photon energy are proportional to each other and depend on the wavelength or frequency of the radiation.

Which of These Is Constant for ALL Types of Electromagnetic