Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 96

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Weekly Quiz Competition

Question 1
4 / -1

The nature of X-rays spectrum is

A
Continuous

B
Line

C
Continuous and line

D
None of the above
Question 2
4 / -1

A 1 µA beam of protons with a cross-sectional area of 0.5 sq. mm is moving with a velocity of 3 × 10⁴ms^–1.Then charge density of beam is

A
6.6 × 10^–4 C/m³

B
6.6 × 10^–5 C/m³

C
6.6 × 10^–6 C/m³

D
None of the above

Solution
Question 3
4 / -1

In the Davission and Germer experiment, the velocity of electrons emitted from the electron gun can beincreased by

A
Decreasing the potential difference between the anode and filament

B
Increasing the potential difference between the anode and filament

C
Increasing the filament current

D
Decreasing the filament current
Question 4
4 / -1

A photon of 1.7 × 10^–13 Joules is absorbed by amaterial under special circumstances. The correct statement is

A
Electrons of the atom of absorbed material will go the higher energy states

B
Electron and positron pair will be created

C
Only positron will be produced

D
Photoelectric effect will occur and electron will be produced

Solution
Question 5
4 / -1

The maximum velocity of an electron emitted by light of wavelength X incident on the surface of a metal of work function ɸ, is
Where h = Planck\'s constant, m = mass of electron and c = speed of light.

A

B

C

D

Solution
Question 6
4 / -1

When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from the photoelectric cell, then

A
The stopping potential will be 0.2 V

B
The stopping potential will be 0.6 V

C
The saturation current will be 6 mA

D
The saturation current will be 18 mA

Solution
Question 7
4 / -1

In a photoemissive cell with exciting wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to 3λ /4, the speed of the fastest emitted electron will be

A
v(3 /4)^1/2

B
v(4 /3)^1/2

C
Less than v(4 /4)^1/2

D
Greater than v(4 /3)^1/2

Solution
Question 8
4 / -1

Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m² falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm² of the surface is nearly

A
9.61 × 10¹⁴ per sec

B
4.12 × 10¹³ per sec

C
1.51 × 10¹² per sec

D
2.13 × 10¹¹ per sec

Solution
Question 9
4 / -1

Photoelectric emission is observed from a metallic surface for frequencies v₁ and v₂ of the incident light rays (v₁> v₂). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is

A

B

C

D

Solution
Question 10
4 / -1

Work function of lithium and copper are respectively 2.3 eV and 4.0 eV. Which one of the metal will be useful for the photoelectric cell working with visible light
(h = 6.6 × 10^–34 J-s, C = 3 × 10⁸ m/s)

A
Lithium

B
Copper

C
Both

D
None of these

Solution