What is the wavelength of an X-ray whose frequency is 2.0 × 1018 Hz? Hint: An X-ray is an electromagnetic wave, so its velocity is equal to the speed of light (3.0 × 108 m/s). A.
1.5 × 10-10 m
B.
3.0 × 10-8 m
C.
6.0 × 10-9 m
D.
0.6 × 10-11 m

A. 1.5 × 10-10 m

Explanation:

Given the following data;

Frequency = 2.0 × 10^18 Hertz.

Speed of light = 3.0 × 10^8 m/s

To find the wavelength;

Wavelength = speed/frequency

Substituting into the equation, we have;

Wavelength = 3.0 × 10^8/2.0 × 10^18

Wavelength = 1.5 × 10-10 meters.