Amplitude of Electromagnetic wave?

1. Dec 26, 2008

The_Thinker

How come the energy of an electromagnetic wave depends only on its frequency?

Given by E = hf.

How come the energy depends only on the frequency of the wave and not on the magnitude of the E component of the wave?

Doesn't the energy depend on the amplitude? Or is there no such thing?

2. Dec 26, 2008