Question

An electron is moving with a speed of 0.97c in a magnetic field of strength 108
G.
Calculate the peak frequency at which the electron will radiate.

Answer 1

The peak frequency for 10⁸ G (10⁴ T) is

$$f=\frac{eB}{2\pi m}=2.8\cdot10^{14}\text{ Hz},$$

or 280 THz.