Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 60

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Weekly Quiz Competition

Question 1
4 / -1

When an inert gas is filled in place of vacuum in a photo cell, then

A
Photo-electric current is decreased

B
Photo-electric current is increased

C
Photo-electric current remains the same

D
Decrease or increase in photo-electric current does not depend upon the gas filled
Question 2
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 3
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 4
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 5
4 / -1

Light from a hydrogen discharge tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2 eV. In order to reduce the photocurrent to zero the voltage of the anode relative to the cathode must be made

A
–4.2 V

B
–9.4 V

C
–17.8 V

D
+9.4 V

Solution
Question 6
4 / -1

The largest distance between the interatomic planes of a crystal is 10^–7 cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

A
1 Å

B
2 Å

C
10 Å

D
20 Å

Solution
Question 7
4 / -1

The velocity, v, at which the mass of a particle is double its rest mass is

A

B

C

D

Solution
Question 8
4 / -1

The wavelength of K_α X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is

A
20

B
60

C
40

D
80

Solution
Question 9
4 / -1

X-ray beam of intensity I₀ passes through an absorption plate of thickness d. If absorption coefficient of material of plate is µ, the correct statement regarding the transmitted intensity I of X-ray is

A
I = I₀(1 – e^–µd)

B
I = I₀ e^–µd

C
I = I₀(1 – e^–µ/d)

D
I = I₀ e^–µ/d)

Solution
Question 10
4 / -1

The K_α X-ray emission line of tungsten occurs λ = 0.021 nm. The energy difference between K and L levels in this atom is about

A
0.51 MeV

B
1.2 MeV

C
59 KeV

D
13.6 eV

Solution