Dual Nature of Radiation and Matter Test

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Dual Nature of Radiation and Matter Test - 15

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Weekly Quiz Competition

Question 1
4 / -1

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

A
each muted electron carries half the initial energy

B
number of electrons emitted is a quarter of the initial number

C
each emitted electron carries one quarter of the initial energy

D
number of eletrons emitted is half the initial number
Question 2
4 / -1

The photosensitive surface is receiving light of wavelength 5000 Å at the rate of 10^-8 J–s^-1 . The number of photons received per sec is

A
2.5 × 10¹⁰

B
2.5 × 10¹¹

C
2.5 × 10¹²

D
2.5 × 10⁹

Solution
Question 3
4 / -1

When light of wavelength 300 nm, falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 600 nm is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

A
1 : 2

B
2: 1

C
4: 1

D
1 : 4
Question 4
4 / -1

Maximum velocity of the photoelectrons emitted by a metal surface is 1.2 × 10⁶ms^-1 . Assuming the specific charge of the electron to be 1.8 × 10¹¹C kg^-1, the value of the stopping potential in volt will be

A
2

B
3

C
4

D
6
Question 5
4 / -1

Which one of the following graph represents the variation of maximum kinetic energy (E_k) of the emitted electrons with frequency v in photoelectric effect correctly ?

A

B

C

D
Question 6
4 / -1

A and B are two metals with threshold frequencies 1.8 × 10¹⁴ Hz and 2.2 × 10¹⁴ Hz. Two identical photons of energy 0.825 eV each are incident on them. Then, photoelectrons are emitted by (take, h = 10^-34 J-s )

A
B alone

B
A alone

C
Neither A nor B

D
Both A and B
Question 7
4 / -1

In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2 × 10^-7 m and stopping potential is 2.5 V. The threshold frequency of the metal (in Hz) approximately (charge of electron, e = 1.6 × 10^-19 C, Planck's constant, h = 6.6 × 10^-34J-s)

A
12 × 10¹⁵

B
9 × 10¹⁵

C
9 × 10¹⁴

D
12 × 10¹³
Question 8
4 / -1

Light of wavelength 5000 Å is falling on a sensitive surface. If the surface has received 10^-7 J of energy, then the number of photons falling on the surface will be

A
5 × 10¹¹

B
2.5 × 10¹¹

C
3 × 10¹¹

D
None of these
Question 9
4 / -1

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in

A
ultraviolet region

B
infrared region

C
visible region

D
X-rays region
Question 10
4 / -1

The specific charge of a proton is 9.6 × 10⁷ C kg^-1 . The specific charge of an alpha particle will be

A
9.6 × 10⁷ C kg^-1

B
19.2 × 10⁷ C kg^-1

C
4.8 × 10⁷ C kg^-1

D
2.4 × 10⁷ C kg^-1

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Dual Nature of Radiation and Matter Test - 15

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Dual Nature of Radiation and Matter Test - 15

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Question 1

each muted electron carries half the initial energy

number of electrons emitted is a quarter of the initial number

each emitted electron carries one quarter of the initial energy

number of eletrons emitted is half the initial number

Question 2

2.5 × 1010

2.5 × 1011

2.5 × 1012

2.5 × 109

Solution

Question 3

1 : 2

2: 1

4: 1

1 : 4

Question 4

2

3

4

6

Question 5

Question 6

B alone

A alone

Neither A nor B

Both A and B

Question 7

12 × 1015

9 × 1015

9 × 1014

12 × 1013

Question 8

5 × 1011

2.5 × 1011

3 × 1011

None of these

Question 9

ultraviolet region

infrared region

visible region

X-rays region

Question 10

9.6 × 107 C kg-1

19.2 × 107 C kg-1

4.8 × 107 C kg-1

2.4 × 107 C kg-1

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2.5 × 10¹⁰

2.5 × 10¹¹

2.5 × 10¹²

2.5 × 10⁹

12 × 10¹⁵

9 × 10¹⁵

9 × 10¹⁴

12 × 10¹³

5 × 10¹¹

2.5 × 10¹¹

3 × 10¹¹

9.6 × 10⁷ C kg^-1

19.2 × 10⁷ C kg^-1

4.8 × 10⁷ C kg^-1

2.4 × 10⁷ C kg^-1