Question

A photon, an electron and a uranium nucleus all have the same wavelength. The one with the most energy.

• A. Is the photon
• B. Is the electron
• C. Is the uranium nucleus
• D. Depends upon the wavelength and the properties of the particle.

Answer 1

Answer: (A)

Is the photon

Answer 2

$\lambda = \frac{h}{mv} = \frac{h}{\sqrt{2mE}}:$ $\therefore\mspace{6mu} E = \frac{h^{2}}{2m\lambda^{2}}$

$\lambda$ is same for all, so $E \propto \frac{1}{m}$. Hence energy will be maximum for particle with lesser mass.