3i Infotech Placement: Sample Questions 453 - 454 of 1245

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Question 453

Question

MCQ▾

The maximum KE of the photoelectron emitted from surface is dependent on

Choices

Choice (4)

a.

The angle of incidence of radiation of the surface

b.

The potential of the collector electrode

c.

The intensity of incident radiation

d.

The frequency of incident radiation

Answer

d.

Explanation

Equation of Kinetic Energy
  • If we change the intensity of the incident beam keeping the frequency of light same, we only change the number of photons.
  • The change in that number cannot affect the kinetic energy of the emitted electrons.
  • The emission of electrons occurs due to a one electron one photon collision. If one photon of insufficient energy collides with an electron and then another one does, the energy of the electron does not become twice that of the incident photon- assuming that the energy gained from the first collision dissipates fast.
  • The maximum KE of the photoelectron emitted from a surface is dependent on the frequency of incident radiation - which changes the energy of each photon.

Question 454

Edit

Statement

True-False▾

Final methods can be overridden.

Answer

FALSE

Explanation

Understanding of Overriding
  • Statement is false
  • Final is used just before data members or even for a class.

For instance,

final method_name ()

final class_name ()

Anything, final cannot be extended or modified.

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