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Dual Nature of Radiation and Matter · Question 73

AIPMT 2003MCQMedium📈 Topic in 0% papers+4−1
1

J.J. Thomson's cathode-ray tube experiment demonstrated that

  1. cathode rays are streams of negatively charged ions
  2. all the mass of an atom is essentially in the nucleus
  3. the e/m of electrons is much greater than the e/m of protons
  4. the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube

Answer

(3) the e/m of electrons is much greater than the e/m of protons

Solution

Thomson deflected cathode rays in crossed electric and magnetic fields and measured their specific charge:

em 1.76 1011 C kg-1

This is about 1836 times the e/m of the hydrogen ion (proton), 9.6 107 C kg-1.

⇒ The e/m of electrons is much greater than that of protons.

(1) is wrong: cathode rays are electrons, not ions. (2) is the result of Rutherford's α-scattering experiment. (4) is wrong: e/m was found to be the same whatever gas or cathode material was used.

Answer: (3)

AIPMT 2003

Keep practising — Dual Nature of Radiation and Matter

2

The value of Planck's constant is

  1. 6.63 10-34 J/sec.
  2. 6.63 10-34 kg-m2/sec2
  3. 6.63 10-34 kg-m2
  4. 6.63 10-34 J-sec.
AIPMT 2002
3

If particles are moving with same velocity, then which has maximum de Broglie wavelength?

  1. proton
  2. -particle
  3. neutron
  4. -particle
AIPMT 2002
4

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
AIPMT 2002
5

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
6

Which one among the following shows particle nature of light?

  1. photoelectric effect
  2. interference
  3. refraction
  4. polarization
AIPMT 2001
7

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
8

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
9

By photoelectric effect, Einstein proved

  1. E = h
  2. K.E. = 12 mv2
  3. E = mc2
  4. E = -Rhcn2
AIPMT 2000
10

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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