Question

What is the wavelength of an FM radio wave of frequency 90Mhz?

a) 0.033m
b) 0.3m
c) 3.3m
d) 30m

Show calculation

Answer 1

3.3m

Step-by-step explanation:

Given parameters:

Frequency = 90Mhz

Unknown:

Wavelength = ?

Solution:

To find the wavelength, use the expression below;

V = f x wavelength

V is the speed of light = 3 x 10⁸m/s

f is the frequency

Now;

Insert the parameters

3 x 10⁸ = 90 x 10⁶ x wavelength

Wavelength =
`(3 x 10^(8) )/(9 x 10^(7) )` = 3.3m