Question 191 of 200
Statement-1 : When ultraviolet light is incident on a photocell, its stopping potential is and the maximum kinetic energy of the photoelectrons is . When the ultraviolet light is replaced by rays, both and increase.
Statement-2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.
Of the four choices given after the statements, choose the one that best describes the two statements.
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Answer: (D) Statement-1 is true, Statement- 2 is false.
Since the frequency of ultraviolet light is less than the frequency of -rays, the energy of each incident photon will be more for X-rays
Stopping potential is to stop the fastest photoelectron
so, and both increases.
But K.E ranges from zero to K.E because of loss of energy due to subsequent collisions before getting ejected and not due to range of frequencies in the incident light.
Stopping potential is to stop the fastest photoelectron
so, and both increases.
But K.E ranges from zero to K.E because of loss of energy due to subsequent collisions before getting ejected and not due to range of frequencies in the incident light.