Question

using the experimental apparatus shown in Figure, when ultraviolet light with a wavelength of 240 nm shines on a particular metal plate, electrons are emitted form plate 1, crossing the gap to plate 2 and causing a current to flow through the wire connecting the two plates. The battery voltage is gradually increased until the current in the ammeter drops to zero, at which point the battery voltage

Answer 1

The experimental apparatus shown in Figure 29.7 is used to study the photoelectric effect. When the current in the ammeter drops to zero, the battery voltage is equal to the potential difference required to stop the emitted electrons from reaching plate 2.

Step-by-step explanation:

The experimental apparatus shown in Figure 29.7 is used to study the photoelectric effect. When ultraviolet light with a wavelength of 240 nm shines on a particular metal plate, electrons are emitted from plate 1. These electrons cross the gap to plate 2 and cause a current to flow through the wire connecting the two plates. The battery voltage is gradually increased until the current in the ammeter drops to zero. At this point, the battery voltage is equal to the potential difference required to stop the emitted electrons from reaching plate 2.