Question

What is the energy of a photon with a frequency of 3.17x10¹1 Hz?4.78x1044J2.09x10-45J2.10x10-22J2.09x10-23J

Answer 1

The energy of a proton is given by:

$E=hf$

where h is Planck's constant and f is the frequency. In this case the frequency is given, plugging the values we have:

$\begin{gathered} E=(6.6262\times10^{-34})(3.17\times10^{11}) \\ E=2.10\times10^{-22} \end{gathered}$

Therefore, the energy is:

$E=2.10\times10^{-22}\text{ J}$