How much energy is in a gamma ray with a frequency of 2.5 $\times$ 10²⁰ s^-1 (E = h$v$ where h = 1.58 $\times$ 10^-34 cal · s)

Question

Quizplus · Accepted Answer

The energy of a gamma ray (or any photon) is given by the equation E = hν, where h is Planck's constant and ν is the frequency of the photon. Given h = 1.58 × 10^-34 cal·s and ν = 2.5 × 10^20 s^-1, substituting these values into the equation gives E = (1.58 × 10^-34 cal·s) × (2.5 × 10^20 s^-1) = 3.95 × 10^-14 cal, which rounds to 4.0 × 10^-14 cal, matching option D.

How Much Energy Is in a Gamma Ray with a Frequency