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Dual Nature of Radiation and Matter · Question 79

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(2) four times

Solution

Number of photoelectrons emitted per second ∝ intensity of incident light.

For a point source, I 1d2

⇒ I'I = ( dd/2 )2 = 4

∴ The number of electrons emitted per second becomes four times.

Answer: (2)

AIPMT 2001

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2

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
3

By photoelectric effect, Einstein proved

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

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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