Question

What is the frequency of light which has `8.33 times 10^-22` joules?

Answer 1

I got `1.25xx10^12Hz`

Explanation:

We can use Einstein's relationship relating eergy `E` and frequency `f` through Planck's constant `h` as:
`E=hf`
rearranging:
`f=E/h`
in your case:
`f=(8.33xx10^-22)/(6.63xx10^-34)=1.25xx10^12Hz`