Question

AM radio signals use amplitude modulation of the radio waves to transmit a signal. A typical wavelength of an AM radio wave is 300. meters. What is the frequency of such a radio wave? a) 1.00 µHz b) 1.00 mHz c) 1.00 kHz d) 1.00 MHz e) 1.00 Hz

Answer 1

Answer:

The frequency of such a radio wave is 1 MHz.

(d) is correct option

Explanation:

Given that,

Wave length = 300 m

We know that,

Speed of light $c= 3\times10^{8}\ m/s$

We calculate the frequency

Using formula of frequency

$c = f\times\lambda$

$f = \dfrac{c}{\lambda}$

Put the value into the formula

$f=\dfrac{3\times10^{8}}{300}$

$f =1\times10^{6}\ Hz$

$f =1\ MHz$

Hence, The frequency of such a radio wave is 1 MHz.