Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 48

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Question 1
4 / -1

When a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell, the saturation current and cut-off voltage are 12.0 mA and 0.5 V. If the same source is placed 0.4 m away from the photoelectric cell, then the saturation current and the stopping potential respectively are

A
4 mA and 1 V

B
12 mA and 1 V

C
3 mA and 0.5 V

D
12 mA and 0.5 V

Solution
Question 2
4 / -1

The threshold wavelength for a metal having work function W₀ is λ₀. What is the threshold wavelength for a metal whose work function is W₀ /2 ?

A
4 λ₀

B
2 λ₀

C
λ₀/2

D
λ₀/4

Solution
Question 3
4 / -1

The time taken by a photoelectron to come out after the photon strikes is approximately

A
10^–10 s

B
10^–16 s

C
10^–1 s

D
10^–4 s
Question 4
4 / -1

Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ\' where

A

B

C

D

Solution
Question 5
4 / -1

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å, then

A
Stopping potential will decrease

B
Stopping potential will increase

C
Kinetic energy of emitted electrons will decrease

D
The value of work function will decrease

Solution
Question 6
4 / -1

Stopping potential required to reduce the photoelectric current to zero

A
Is directly proportional to wavelength of the incident radiation

B
Increases uniformly with wavelength of the incident radiation

C
Is directly proportional to frequency of the incident radiation

D
Decreases uniformly with the frequency of the incident radiation
Question 7
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 8
4 / -1

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

A
540 nm

B
400 nm

C
310 nm

D
220 nm

Solution
Question 9
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 10
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