Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 20

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Question 1
4 / -1

A 5 W source emits monochromatic light of wavelength 5000 Å . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of

A
4

B
8

C
16

D
2
Question 2
4 / -1

Stopping potential required to reduce the photoelectric current to zero

A
is directly proportional to the wavelength of the incident radiation

B
increases uniformly with wavelength of the incident radiation

C
is directly proportional to the frequency of the incident radiation

D
decreases uniformly with the frequency of the incident radiation
Question 3
4 / -1

From the figure, describing photoelectric effect we may infer correctly that

A
Na and Al both have the same threshold frequency

B
maximum kinetic energy for both the metals depend linearly on the frequency

C
the stopping potentials are different for Na and Al for the same change in frequency

D
Al is a better photo sensitive material than Na
Question 4
4 / -1

In Bainbridge mass spectrograph, the ion C¹² strikes the photograph plate at a distance of 12 cm from the slit. At what distance from the slit will be ion C¹⁴ strike?

A
1.4 cm

B
0.14 m

C
14 m

D
7 cm

Solution
Question 5
4 / -1

Planck’s constant has the dimensions of

A
Energy

B
Mass

C
Frequency

D
Angular momentum

Solution
Question 6
4 / -1

Energy of a photon can not be represented by

A

B

C

D

Solution
Question 7
4 / -1

A particle which has zero rest mass and non – zero energy and momentum must travel with a speed of

A
equal to c, the speed of light in vacuum.

B
Greater than c

C
Less than c

D
Tending to infinity
Question 8
4 / -1

The work function of metal surface is 4.2 eV. The maximum wavelength which can eject electrons from this metal surface is

A
3076Å

B
4116Å

C
2956Å

D
5088Å

Solution
Question 9
4 / -1

A photocell with a constant p.d of V volt across it is illuminate by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electron emitted by the photocell.

A
carry 1⁄4 th their previous energy

B
are 1/16 th as numerous as before

C
are 1⁄4 th as numerous as before

D
are 1⁄4 th their previous momentum.

Solution
Question 10
4 / -1

The correct curve between the stopping potential (Vs) and intensity of incident light (I) is

A

B

C

D