Question 290: Dual Nature of Matter and Radiation

Question

In a photoelectric experiment, if the intensity of incident light is doubled and the frequency is kept slightly greater than threshold frequency, then the saturation photoelectric current

Accepted Answer

The correct answer is:
Option C: is doubled
Explanation:
The
saturation photoelectric current
is the maximum current obtained when all the emitted photoelectrons are collected.
The number of photoelectrons emitted per second depends on the number of photons incident per second, i.e., it is
directly proportional to the intensity
of incident light (provided frequency is above threshold).
If the intensity is
doubled
(and frequency > threshold frequency),
twice as many photons
hit the metal surface per second, so twice as many electrons are emitted per second.
Hence, the
saturation current
is
doubled
.
Thus, doubling the intensity (keeping frequency constant and just above threshold)
doubles
the saturation photoelectric current.
So, the answer is Option C.

Answer

remains constant

Answer

is halved

Answer

is doubled

Answer

becomes four times

Dual Nature of Matter and Radiation

In a photoelectric experiment, if the intensity of incident light is doubled and the frequency is kept slightly greater than threshold frequency, then the saturation photoelectric current

Choose the correct answer: