Find the wavelength of these light waves?

Question

A typical frequency for a portable telephone is 2.3GHz, which is two point three billion cycles per second. Find the wavelength of these light waves?

Answer 1

Well, velocity = wavelength x frequency. Therefore, wavelength = v/f. They are light waves, therefore their speed is 3.0 x 10^8 m/s.

So....

We know the frequency is 2.3 x 10^9 Hz (giga)

We know that the speed is 3.0 x 10^8 m/s

So wavelength = (3.0x 10^8 m/s) / (2.3 x10^9 Hz)

Wavelength = 0.13 m, or 13 cm.