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Dual Nature of Radiation and Matter · Question 72

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(4) number of electrons emitted is a quarter of the initial number

Solution

For a point source, intensity I 1r2

⇒ I2I1 = ( 12 )2 = 14

As per NCERT, the photoelectric current (number of electrons emitted per second) is directly proportional to the intensity of incident light, while the kinetic energy of each photoelectron depends only on the frequency of light.

∵ Frequency is unchanged, the energy of each emitted electron is unchanged.

∴ Number of electrons emitted becomes one quarter of the initial number.

Answer: (4)

AIPMT 2003

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2

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
3

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
4

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

  1. proton
  2. -particle
  3. neutron
  4. -particle
AIPMT 2002
5

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
6

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
7

Which one among the following shows particle nature of light?

  1. photoelectric effect
  2. interference
  3. refraction
  4. polarization
AIPMT 2001
8

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
9

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
10

By photoelectric effect, Einstein proved

  1. E = h
  2. K.E. = 12 mv2
  3. E = mc2
  4. E = -Rhcn2
AIPMT 2000
11

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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