Question

In photo electric effect
A. The photocurrent is proportional to the intensity of the incident radiation.
B. Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light.
C. Max. K.E with which photoelectrons are emitted depends on the frequency of incident light.
D. The emission of photoelectrons require a minimum threshold intensity of incident radiation.
E. Max. K.E of the photoelectrons is independent of the frequency of the incident light.
Choose the correct answer from the options given below:

• A. A and B only
• B. B and C only
• C. A and C only
• D. A and E only

Answer 1

The Correct Option is C

The photoelectric effect is described by Einstein's photoelectric equation: \[ h\nu = \phi + \text{KE}_{\text{max}}, \] where: 
 \( h \nu \) is the energy of the incident photon, 
 \( \phi \) is the work function (minimum energy required to emit an electron), 
 \( \text{KE}_{\text{max}} \) is the maximum kinetic energy of the emitted photoelectrons. 
Analysis of statements: 
 \( A: \) True. The photocurrent (number of photoelectrons emitted per second) is proportional to the intensity of the incident radiation, which determines the number of photons. 
 \( B: \) False. The maximum kinetic energy of photoelectrons depends on the frequency, not the intensity. 
 \( C: \) True. The maximum kinetic energy depends on the frequency of the incident light (\( \nu \)) through the equation \( \text{KE}_{\text{max}} = h\nu - \phi \). 
 \( D: \) False. The emission of photoelectrons depends on the frequency of the light exceeding the threshold frequency, not intensity. 
 \( E: \) False. The maximum kinetic energy depends on the frequency. 
Final Answer: The correct statements are: \[ \boxed{\text{(3) \( A \) and \( C \) only}}. \]