The threshold wavelength of a certain metal is

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

Problem

500\,\text{nm}

. Which of the following incident radiations will produce photoelectric emission from the metal? (a) Both

400\,\text{nm}

and

600\,\text{nm}

(b)

400\,\text{nm}

only (c)

600\,\text{nm}

only (d) Neither

400\,\text{nm}

nor

600\,\text{nm}