Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 51

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Weekly Quiz Competition

Question 1
4 / -1

Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be

A
0 eV

B
1 eV

C
2 eV

D
10 eV
Question 2
4 / -1

According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum?

A
Energy and momentum

B
Speed and momentum

C
Speed only

D
Energy only

Solution
Question 3
4 / -1

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of their threshold wavelengths is nearest to

A
1 : 2

B
4 : 1

C
2 : 1

D
1 : 4

Solution
Question 4
4 / -1

A caesium photocell, with a steady potential difference of 60 V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1 m away the photoelectrons emitted from the cell

A
Are one quarter as numerous

B
Are half as numerous

C
Each carry one quarter of their previous momentum

D
Each carry one quarter of their previous energy

Solution
Question 5
4 / -1

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100 W is (taking h = 6 × 10^–34 J-s)

A
100

B
1000

C
3 × 10²⁰

D
3 × 10¹⁸

Solution
Question 6
4 / -1

Light of frequency 4v₀ is incident on the metal of the threshold frequency v₀. The maximum kinetic energy of the emitted photoelectrons is

A
3 hv₀

B
2 hv₀

C

D

Solution
Question 7
4 / -1

By photoelectric effect, Einstein, proved

A

B

C

D
Question 8
4 / -1

Two identical photo-cathodes receive light of frequencies f₁ and f₂. If the velocities of the photo electrons (of mass m) coming out are respectively v₁ and v₂, then

A

B

C

D

Solution
Question 9
4 / -1

Consider the two following statements A and B and identify the correct choice given in the answers;
(A) In photovoltaic cells the photoelectric current produced is not proportional to the intensity of incident light
(B) In gas filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation

A
Both A and B are true

B
Both A and B are false

C
A is true but B is false

D
A is false B is true
Question 10
4 / -1

When radiation of wavelength λ is incident on a metallic surface, the stopping potential is 4.8 volts. If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is

A
2 λ

B
4 λ

C
6 λ

D
8 λ

Solution