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Dual Nature of Radiation and Matter

AIPMT 2001MCQEasy📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2001

Which one among the following shows particle nature of light?

  1. photoelectric effect
  2. interference
  3. refraction
  4. polarization

Answer

(1) photoelectric effect

Solution

Interference and polarization are explained only by the wave nature of light, and refraction is also explained by the wave theory.

In the photoelectric effect, light behaves as a stream of photons, each of energy E = h ; one photon is absorbed by one electron, so the emission is instantaneous and the maximum kinetic energy depends on frequency, not on intensity.

∴ The photoelectric effect shows the particle nature of light.

Answer: (1)

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Ques. 2AIPMT 2001

A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance becomes d/2, then number of electrons emitted per second, will be

  1. remain same
  2. four times
  3. two times
  4. one-fourth
Ques. 3AIPMT 2001

The interplanar distance in a crystal is 2.8 10-8 m. The value of maximum wavelength which can be diffracted is

  1. 2.8 10-8 m
  2. 5.6 10-8 m
  3. 1.4 10-8 m
  4. 7.6 10-8 m
Ques. 4AIPMT 2000

By photoelectric effect, Einstein proved

  1. E = h
  2. K.E. = 12 mv2
  3. E = mc2
  4. E = -Rhcn2
Ques. 5AIPMT 2000

Who evaluated the mass of electron indirectly with help of charge

  1. Thomson
  2. Millikan
  3. Rutherford
  4. Newton

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