What is the frequency of a photon of light that has an energy of 2.95 × 10−17 J?
Physics ( from Wikipedia)
Photon energy is directly proportional to frequency.
E = h f
E is energy (J)
h is Planck's constant: 6.62607015 × 10−34 (m2kgs−1)
f is frequency (Hz)
E/h = f
2.95 x 10-17 / ( 6.62607015 x 10 -34) = f