Question

The frequency of an x-ray wave is 3 Hz and its wave speed is 90 m/s. What is the x-rays wavelength?

Answer 1

The frequency is
=
2⋅10^18 Hz

Answer 2

Solution:
Frequency (f) = 3Hx
Wave speed ( v) = 90m/s
Wavelength. = ?
We know ,
v = frequency . Wavelength
or, 90 = 3 multiply wavelength
or, 90 = 3 wavelength
or, 90/3 = wavelength
or, 30 = wavelength
Wavelength = 30 m