Question

Light waves travel at 3 × 10 8 m/s. If the light wave has a particular wavelength of 400 nm (400 × 10 –9 m), calculate its frequency.

Answer 1

`f=7.5* 10^(14)\ Hz`

Step-by-step explanation:

Given that,

The wavelength of light,
`\lambda=400\ nm=400* 10^(-9)\ m`

The speed of light,
`c=3* 10^8\ m/s`

We need to find the frequency of light. We know that,

`c=f\lambda`

Where

f is the frequency

So,

`f=(c)/(\lambda)\\\\f=(3* 10^8)/(400* 10^(-9))\\\\f=7.5* 10^(14)\ Hz`

So, the frequency of light is
`7.5* 10^(14)\ Hz`.