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

3.3m

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 =   = 3.3m

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2