The longest-wavelength photon that can remove an electron from a neutral atom has…

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

The longest-wavelength photon that can remove an electron from a neutral atom has wavelength

\lambda_0

. Which expression gives the atom’s binding (ionization) energy

E_b

? (a)

E_b = \dfrac{2hc}{\lambda_0}

(b)

E_b = \dfrac{hc}{2\,\lambda_0}

(c)

E_b = \dfrac{hc}{\lambda_0}

(d)

E_b = \dfrac{\hbar c}{\lambda_0}