Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 82

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is

A
4.81 V

B
3.74 V

C
2.66 V

D
1.07 V

Solution
Question 2
4 / -1

When light falls on a metal surface, the maximum kinetic energy of the emitted photo-electrons depends upon

A
The time for which light falls on the metal

B
Frequency of the incident light

C
Intensity of the incident light

D
Velocity of the incident light

Solution
Question 3
4 / -1

The electrons are emitted in the photoelectric effect from a metal surface

A
Only if the frequency of the incident radiation is above a certain threshold value

B
Only if the temperature of the surface is high

C
At a rate that is independent of the nature of the metal

D
With a maximum velocity proportional to the frequency of the incident radiation
Question 4
4 / -1

The work function of a metal is 4.2 eV, its threshold wavelength will be

A
4000 Å

B
3500 Å

C
2946 Å

D
2500 Å

Solution
Question 5
4 / -1

The number of photo-electrons emitted per second from a metal surface increases when

A
The energy of incident photons increases

B
The frequency of incident light increases

C
The wavelength of the incident light increases

D
The intensity of the incident light increases

Solution
Question 6
4 / -1

The work function of metal is 1 eV. Light of wavelength 3000 Å is incident on this metal surface. The velocity of emitted photo-electrons will be

A
10 m/s

B
1 × 10³ m/s

C
1 × 10⁴ m/s

D
1 × 10⁶ m/s

Solution
Question 7
4 / -1

Energy from the sun is received on earth at the rate of 2 cal per cm² per min. If average wavelength of solar light be taken at 5500 Å then how many photons are received on the earth per cm² per min?
(h = 6.6 × 10^–34 J-s, 1 cal = 4.2 J)

A
1.5 × 10¹³

B
2.9 × 10¹³

C
2.3 × 10¹⁹

D
1.75 × 10¹⁹

Solution
Question 8
4 / -1

The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000 A falls on it. The potential difference applied to stop the fastest photo-electrons is
[h = 4.14 × 10^–15 eV sec]

A
1.2 volts

B
2.24 volts

C
3.6 volts

D
4.8 volts

Solution
Question 9
4 / -1

A photon of energy E ejects a photo electron from a metal surface whose work function is W₀. If this electron enters into a uniform magnetic field of induction B in a direction perpendicular to the field and describes a circular path of radius r, then the radius r, is given by, (in the usual notation)

A

B

C

D

Solution
Question 10
4 / -1

Photoelectric effect was first successfully explained by

A
Planck

B
Hallwach

C
Hertz

D
Einstein