Question

a-What is the wavelength of a electromagnetic wave that has a frequency of 4.95×1014 Hz?

b-Calculate the frequency of an EM wave with a wavelength of 400 nm

Answer 1

Solution:

Part(a). Light wave is an electromagnetic wave. Wavelength of an electromagnetic wave is given by

(1)

Where,

= wavelength of electromagnetic wave

= frequency of electromagnetic wave

= velocity of electromagnetic wave

Given that:

Putting these valuese in equation (1),we get

    (2)

Part(b). Similarly, from equation (1), frequency of an electromagnetic wave is given by

(3)

From question:

Substituting these valuese in equation (3), we find

(4)