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, $2.0\times 10^{-5}m$

Explanation : Given,

Frequency of the light = $1.50\times 10^{13}Hz$

Formula used :

$\nu=\frac{c}{\lambda}$

where,

$\nu$ = frequency of light  = $1.50\times 10^{13}Hz=1.50\times 10^{13}s^{-1}$

$\lambda$ = wavelength of light  = ?

c = speed of light = $3\times 10^8m/s$

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

$1.50\times 10^{13}s^{-1}=\frac{3\times 10^8m/s}{\lambda}$

$\lambda=2.0\times 10^{-5}m$

Therefore, the frequency of the light is, $2.0\times 10^{-5}m$