Question

The wavelength $λ$ of a photon and the de-Broglie wavelength of an electron have the same value. Find the ratio of energy of photon to the kinetic energy of electron in terms of mass $m$, speed of light $c$ and planck constant.

• A. $\frac {λmc}{h}$
• B. $\frac {hmc}{λ}$
• C. $\frac {2hmc}{λ}$
• D. $\frac {2λmc}{h}$

Answer 1

Answer: (D)

$\frac {2λmc}{h}$

Answer 2

The correct option is (D): $\frac {2λmc}{h}$.