Question

What is the wavelength of the light emitted that has a frequency of 1.50 x 1013 Hz? 2.5 x 10-21 m 2.0 x 10-5 m 5.0 x 105 m 4.5 x 1021 m

Answer 1

v (speed) = f (frequency) ­* y (meant to be lambda) (wavelength)
y = v/f (v is speed of light --3.0*10^8m/s)
y = 3.0*10^8/1.5*10^13
The answer is y = 2.0*10-5.

Answer 2

Answer : The frequency of the light is,
`2.0* 10^(-5)m`

Explanation : Given,

Frequency of the light =
`1.50* 10^(13)Hz`

Formula used :

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

where,

`\\u` = frequency of light =
`1.50* 10^(13)Hz=1.50* 10^(13)s^(-1)`

`\lambda` = wavelength of light = ?

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

Now put all the given values in the above formula, we get the wavelength of the light.

`1.50* 10^(13)s^(-1)=(3* 10^8m/s)/(\lambda)`

`\lambda=2.0* 10^(-5)m`

Therefore, the frequency of the light is,
`2.0* 10^(-5)m`