Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 72

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Weekly Quiz Competition

Question 1
4 / -1

If light of wavelength λ₁ is allowed to fall on a metal, then kinetic energy of photoelectrons emitted is E₁. If wavelength of light changes to λ₂ then kinetic energy of electrons changes to E₂. Then work function of the metal is

A

B

C

D

Solution
Question 2
4 / -1

If maximum velocity with which an electron can be emitted from a photo cell is 4 × 10⁸ cm/s, the stopping potential is (mass of electron = 9 × 10^–31 kg)

A
30 volt

B
45 volt

C
59 volt

D
Information is insufficient

Solution
Question 3
4 / -1

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photo current is recorded. An electric field is switched on which has a vertically downward direction

A
The photo current will increase

B
The kinetic energy of the electrons will increase

C
The stopping potential will decrease

D
The threshold wavelength will decrease

Solution
Question 4
4 / -1

If the momentum of an electron is charged by ∆p, then the de-Broglie wavelength associated with it changes by 0.50% . The initial momentum of the electron will be

A

B

C
199 ∆p

D
400 ∆p

Solution
Question 5
4 / -1

If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie wavelength of the incident electrons to the shortest wavelength of X-ray produced (e/m for electron is 1.8 × 10¹¹c kg^–1)

A
1

B
0.1

C
0.2

D
0.3

Solution
Question 6
4 / -1

Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out it\'s de-Broglie wavelength is

A
1.22 Å

B
1.75 Å

C
2 Å

D
None of the above

Solution
Question 7
4 / -1

If the potential difference between the anode and cathode of the X-ray tube is increase

A
The peaks at R and S would move to shorter wavelength

B
The peaks at R and S would remain at the same wavelength

C
The cut off wavelength at P would decrease

D
(b) and (c) both are correct

Solution
Question 8
4 / -1

Monochromatic light of wavelength 3000 Å is incident on a surface area 4 cm². If intensity of light is 150 mW/m², then rate at which photons strike the target is

A
3 × 10¹⁰/s

B
9 × 10¹³/s

C
7 × 10¹⁵/s

D
6 × 10¹⁹/s

Solution
Question 9
4 / -1

For characteristic X-ray of some material

A
E (K_γ) < E(K_β)< E(K_α)

B
E(K_α)α)α)

C
λ(K_γ) < λ(K_β < λ (K_α)

D
λ (M_α ) < λ (L_α) < λ (K_α)

Solution
Question 10
4 / -1

The maximum velocity of electrons emitted from a metal surface is V when frequency of light falling on it is f. The maximum velocity when frequency becomes 4f is

A
2 V

B
> 2 V

C
< 2 V

D
Between 2 V and 4 V

Solution