MCQ
Which theory of light explains the photoelectric effect?
  • A
    Electromagnetic theory
  • B
    Magnetic theory
  • C
    Electric theory
  • D
    Wave theory

Answer

  1. Electromagnetic theory

Explanation:

According to the electromagnetic theory, the photoelectric effect can be attributed to the transfer of energy from the light to an electron. From this point of view, an alteration in the intensity of light will induce changes in the kinetic energy of the electrons emitted from the metal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber. Then
A freshly prepared radioactive source of half-life 2h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is:

The ratio of charge to potential of a body is known as

(a) Capacitance

(b) Conductance

(c) Inductance

(d) Resistance

In the given nuclear reaction A, B, C, D, E represents     

(a) A = 234, B = 90, C = 234, D = 91, E = β

(b) A = 234, B = 90, C = 238, D = 94, E = α

(c) A = 238, B = 93, C = 234, D = 91, E = β

(d) A = 234, B = 90, C = 234, D = 93, E = α

Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is

(a) 4 

(b)  

(c) 2

(d)  

The source of stellar energy is:
A student plots a graph from his reading on the determination of Young modulus of a metal wire but forgets to put the labels. the quantities on X and Y axes may be respectively:
  1. Weight hung and length increased.
  2. Stress applied and length Increased.
  3. Stress applied and strain developed.
  4. Length increased and the weight hung.
​​​​​​​
The mean intensity in the interference pattern obtained from two coherent sources of equal intensity $I _0$ will be :
The energy gap between the valence band and the condition band for a material is 6eV. The material is?

The radius of curvature of the path of the charged particle in a uniform magnetic field is directly proportional to

(a) The charge on the particle

(b) The momentum of the particle

(c) The energy of the particle

(d) The intensity of the field