A research setup requires photoelectrons to emerge with speeds of at least from a…

PHYSICS · Single correct · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

A research setup requires photoelectrons to emerge with speeds of at least

8.0 \times 10^{5}\,\text{m/s}

from a metal whose work function is

2.4\,\text{eV}

. Which of the following laser wavelengths will satisfy this requirement? (a)

520\,\text{nm}

(b)

690\,\text{nm}

(c)

250\,\text{nm}

(d)

350\,\text{nm}