Question

Calculate the frequency in hertz of photons of light with energy of 8.10 × 10-19 J.

Answer 1

The Planck–Einstein relation
`E=hv` gives that E, the photon energy, is equal to h, Planck's constant, times ν, the frequency.

We can solve the equation in terms of frequency to get

`v= (E)/(h)`

We substitute our given energy,
`8.10 * 10^(-19) J`, and Planck's constant,
`6.626 * 10^(-34) Js`.


`v= (8.10 * 10^(-19) J)/(6.626 * 10^(-34) Js)=1.22 * 10^(15) s^(-1)=1.22 * 10^(15) Hz`