I hope this picture helps :)
The Planck–Einstein relation

gives that E, the photon energy, is equal to h, Planck's constant, times <span>ν</span>, the frequency.
We can solve the equation in terms of frequency to get

We substitute our given energy,

, and Planck's constant,

.
Answer:
this is the answer and the work btw I just took a screenshot this I have way better handwriting
22 because it can be it for right case of fire fire reacts to the flame