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Dual Nature of Radiation and Matter · Question 67

AIPMT 2006MCQEasy📈 Topic in 0% papers+4−1
1

In a discharge tube ionization of enclosed gas is produced due to collisions between

  1. neutral gas atoms/molecules
  2. positive ions and neutral atoms/molecules
  3. negative electrons and neutral atoms/molecules
  4. photons and neutral atoms/molecules.

Answer

(3) negative electrons and neutral atoms/molecules

Solution

In a discharge tube at low pressure, the few free electrons present are accelerated by the high potential difference.

∴ These fast electrons collide with neutral gas atoms/molecules and knock out further electrons, producing ionization of the gas.

Answer: (3)

AIPMT 2006

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2

The momentum of a photon of energy 1 MeV in kg m/s will be

  1. 5 10-22
  2. 0.33 106
  3. 7 10-24
  4. 10-22
AIPMT 2006
3

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 A is/are

  1. A only
  2. A and B only
  3. all the three metals
  4. none
AIPMT 2005
4

A photosensitive metallic surface has work function, h 0. If photons of energy 2h 0 fall on this surface, the electrons come out with a maximum velocity of 4 106 m/s. When the photon energy is increased to 5h 0, then maximum velocity of photoelectrons will be

  1. 2 107 m/s
  2. 2 106 m/s
  3. 8 106 m/s
  4. 8 105 m/s
AIPMT 2005
5

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004
6

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

  1. each emitted electron carries one quarter of the initial energy
  2. number of electrons emitted is half the initial number
  3. each emitted electron carries half the initial energy
  4. number of electrons emitted is a quarter of the initial number
AIPMT 2003
7

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
AIPMT 2003
8

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
9

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

  1. proton
  2. -particle
  3. neutron
  4. -particle
AIPMT 2002
10

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
11

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

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