Question

Which of the following statement is wrong regarding the photo electric effect.

• A. Photo electric current is directly proportional to the intensity of the incident radiation
• B. The maximum kinetic energy of the electrons emitted depends on the intensity of the incident radiation
• C. The maximum kinetic energy of the electrons emitted depends on the frequency of the incident radiation
• D. The value of the stopping potential increases with the increase in frequency of the incident radiation

Hint:

Intensity controls number of electrons, frequency controls energy of electrons.

Answer 1

The Correct Option is B

Step 1: Understand photoelectric current.
Photoelectric current depends on number of emitted electrons, hence depends on intensity.

Step 2: Relation of kinetic energy.
Maximum kinetic energy is given by:
\[ K_{max} = h\nu - \phi \]

Step 3: Dependence on intensity.
Intensity affects number of electrons, not their energy.

Step 4: Dependence on frequency.
Kinetic energy depends only on frequency of incident radiation.

Step 5: Stopping potential relation.
\[ eV_0 = K_{max} \]

Step 6: Hence stopping potential increases with frequency.
Thus statement (D) is correct.

Step 7: Final Answer.
\[ \boxed{\text{Statement B is wrong}} \]