Question

How many of the following metals produce photoelectrons with incidence of radiation of energy 5.3eV . Metal Li Na Mg Cu Al Work function eV 2.42 2.3 3.7 4.8 5.7

Answer 1

Explanation:

When light strikes materials, it can eject electrons from them. This is called the photoelectric effect, meaning that light (photo) produces electricity. One common use of the photoelectric effect is in light meters, such as those that adjust the automatic iris on various types of cameras. In a similar way, another use is in solar cells, as you probably have in your calculator or have seen on a roof top or a roadside sign. These make use of the photoelectric effect to convert light into electricity for running different devices.

An image of a vacuum tube is shown.