Physics

Problem

The threshold wavelength of a certain metal is

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}

400\,\text{nm}

only c)

600\,\text{nm}

only d) Neither

400\,\text{nm}

nor

600\,\text{nm}