What is the energy in electron-volts (ev) of a photon of green light that has a wavelength of 520 nm? (1.0 m = 1.0 × 10^-9m)

3.8 × 10^-19ev
3.4 × 10^-40ev
2.4ev
2.2 × 10^-21ev

The energy of a photon is .

Explanation:

Given that,

Wave length = 520 nm

Using plank's equation

...(I)

Here, h = plank constant

υ = frequency

Now, using wave equation

The equation can be written as:

Here, c = speed of light

λ= wave length of light

Put the value of υ in equation (I)

The energy of photon is

Hence, The energy of a photon is .