Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 84

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Weekly Quiz Competition

Question 1
4 / -1

An electromagnetic radiation has an energy of 13.2 keV. Then the radiation belongs to the region of

A
Visible light

B
Ultraviolet

C
Infrared

D
X-ray

Solution
Question 2
4 / -1

As the intensity of incident light increases

A
Photoelectric current increases

B
Photoelectric current decreases

C
Kinetic energy of emitted photoelectrons increases

D
Kinetic energy of emitted photoelectrons decreases
Question 3
4 / -1

Light of wavelength 5000 Å falls on a sensitive plate with photoelectric work fucntion of 1.9 eV. The kinetic energy of the photoelectron emitted will be

A
0.58 eV

B
2.48 eV

C
1.24 eV

D
1.16 eV

Solution
Question 4
4 / -1

Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment?

A
Work function of the surface

B
Amount of photoelectric current

C
Stopping potential will be reduced

D
Maximum kinetic energy of photoelectrons
Question 5
4 / -1

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy of 6 eV fall on it is 4 eV. The stopping potential in volts is

A
2

B
4

C
6

D
10

Solution
Question 6
4 / -1

Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface

A
4000 Å, 7500 Å

B
5500 Å, 6000 Å

C
4000 Å, 6000 Å

D
None of these

Solution
Question 7
4 / -1

The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

A
Double the earlier value

B
Unchanged

C
More than doubled

D
Less than doubled

Solution
Question 8
4 / -1

When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters

A
1 : 2

B
2 : 1

C
4 : 1

D
1 : 4

Solution
Question 9
4 / -1

Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is

A
15 J

B
16 × 10^–14 J

C
4 × 10^–19 J

D
4 × 10^–81 J

Solution
Question 10
4 / -1

The cathode of a photoelectric cell is changed such that the work function changes from W₁ to W₂ (W₂> W₁). If the current before and after change are I₁ and I₂, all other conditions remaining unchanged, then (assuming hv> W₂)

A
I₁= I₂

B
I₁2

C
I₁>I₂

D
I₁2<2I₁

Solution