Question

How much energy does a photon of frequency `6 x 10^12` Hz have?

Answer 1

I tried this:

Explanation:

We can use Einstein's relationship for energy:
`E=hf`
Where `f` is frequency and `h` is Planck's constant.
In numbers:
`E=6.63×10^(-34)*6×10^(12)~~4×10^(-21)J`