Question
The maximum velocity of electrons, emitted from a metal surface of negligible work function is v, when frequency of light falling on it is f. What will be the maximum velocity when the frequency of incident light made 4f?
Solution
Maximum velocity of electrons = v
Frequency of incident light = f
Max. velocity when incident light is 4f = ?
Using Einstein's photoelectric equation, we have
Since, work function is negligibe,
Thus, for frequency,
we have,
Thus, maximum velocity will be doubled when, frequency is made 4 times.
Frequency of incident light = f
Max. velocity when incident light is 4f = ?
Using Einstein's photoelectric equation, we have
Since, work function is negligibe,
Thus, for frequency,
we have,
Thus, maximum velocity will be doubled when, frequency is made 4 times.
