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Dual Nature of Radiation and Matter · Question 76

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

When ultraviolet rays are incident on a metal plate, photoelectric effect does not occur. It occurs by incidence of

  1. infrared rays
  2. X-rays
  3. radio waves
  4. microwaves

Answer

(2) X-rays

Solution

As per NCERT, photoelectric emission occurs only if the frequency of the incident radiation is greater than the threshold frequency 0 of the metal.

∵ UV does not cause emission ⇒ 0 > UV

⇒ Radiation of still higher frequency is needed.

∵ X-rays > UV > IR > microwave > radio

∴ Photoelectric effect can occur with X-rays.

Answer: (2)

AIPMT 2002

Keep practising — Dual Nature of Radiation and Matter

2

Which of the following is not the property of cathode rays?

  1. It produces heating effect
  2. It does not deflect in electric field
  3. It casts shadow
  4. It produces fluorescence.
AIPMT 2002
3

Which one among the following shows particle nature of light?

  1. photoelectric effect
  2. interference
  3. refraction
  4. polarization
AIPMT 2001
4

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
AIPMT 2001
5

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
AIPMT 2001
6

By photoelectric effect, Einstein proved

  1. E = h
  2. K.E. = 12 mv2
  3. E = mc2
  4. E = -Rhcn2
AIPMT 2000
7

Who evaluated the mass of electron indirectly with help of charge

  1. Thomson
  2. Millikan
  3. Rutherford
  4. Newton
AIPMT 2000

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