1. The speed of all electromagnetic waves in empty space is 3.00 × 108 m/s.
What is the wavelength of radio waves emit- ted at 96.9 MHz?
Answer in units of m.
2. What is the wavelength of visible light emit- ted at 4.6 × 108 MHz?
Answer in units of m.
3. What is the wavelength of X rays emitted at 3.4 × 1012 MHz?
Answer in units of m.

1. 3.10 m

2. 0.65 m

3.

Explanation:

Speed of light, s is given as the product of frequency and wavelength and expressed as s=wf where s is the speed of light, w is the wavelength in m and f is the frequency in Hz. Making wavelength, w the subject of the formula then

and making substitution for all the three parts then

1.

Substituting f for 96.9 MHz which is equivalent to and s for then

2.

The frequency is given as  note that the units should be Hz not MHz after giving it already raised to power 10 and substituting this for f and for s then

3.

The frequency is given as and substituting this for f and for s then