Question

The speed of an electromagnetic wave is a constant, 3.0 × 10 8m/s. The wavelength of a wave is 0.6 meters.What is the frequency?

a.1.8 × 10 8HzB.5.0 HzC1.8 HzD.5.0 × 10 8Hz

Answer 1

Wave speed= frequency * wavelength

Frequency=wave speed/wavelength

Frequency = 3 x 10^8M/s/0.6m

=500000000Hz

So the answer is D.5.0*10^8Hz

Answer 2

Explanation :

It is given that,

Speed of the electromagnetic wave,
`v=3* 10^8\ m/s`

Wavelength,
`\lambda=0.6\ m`

We know that the relation between the speed, frequency and the wavelength is given by :

`v=\\u * \lambda`

`\\u=(v)/(\lambda)`

`\\u=(3* 10^8\ m/s)/(0.6\ m)`

`\\u=500000000\ Hz`

or

`\\u=5* 10^8\ Hz`

So, the correct option is (D).

Hence, this is the required solution.