David Sang and Graham Jones Solutions for Chapter: Quantum Physics, Exercise 3: Question

An electron travels through a cell of e.m.f. $1.2 \mathrm{V}$ Calculate the energy is transferred to the electron. Give your answer in both eV and J.

Calculate the energy in eV of an X-ray photon of frequency $3.0\times {10}^{18}\mathrm{Hz}$. (Use: $h=6.63\times {10}^{-34 }\mathrm{J} \mathrm{s}$)

With the help of a calculation, identify the region of the electromagnetic spectrum (Figure) a photon of energy 10 eV belongs.