Dual Nature of Radiation and Matter Test

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Dual Nature of Radiation and Matter Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Work function of a metal is the

A
energy required by an electron to escape from the metal surface

B
maximum energy required by an electron to escape from the metal surface

C
minimum energy required by an electron to escape from the metal surface

D
energy required by an electron to get absorbed in the metal surface

Solution

When the light strikes on a metal surface, electrons on the surface of the metal get energy from the light and get emitted from the surface. There will be no photo emission from a metal surface below a certain frequency of light. For photo emission minimum frequency of incident light is required. This minimum energy of an electron is called work function.
Question 2
1 / -0

In which case is electron emission from a metal not known?

A
Illuminating a metal surface with suitable light

B
Heating the metal sufficiently

C
Applying a very strong electric field to a metal

D
Applying a very strong magnetic field to a metal

Solution

Photo emission, thermo emission and electric field emission are known. Emission of electrons due to magnetic field is not known.
Question 3
1 / -0

Photoelectric effect is

A
emission of electrons by metals when illuminated by light of suitable frequency

B
emission of electrons by metals when heated

C
emission of electrons by glass when illuminated by light of suitable frequency

D
emission of electrons by insulators when illuminated by light of suitable frequency

Solution

When the light strikes on a metal surface, electrons on the surface of the metal get energy from the light and get emitted from the surface. It is found that there will be no photoemission from a metal surface below a certain frequency of light. The phenomenon of emission of photoelectron from a metal surface by light of suitable frequency is called photoelectric effect.
Question 4
1 / -0

Photoelectric effect is possible

A
with only white light

B
with only ultraviolet

C
with both visible and uv depending on the metal

D
with only visible

Solution

Emission of photo-electron takes place when energy of incident photon is greater than that of work function of material. Work function is different for different material. Photoelectric effect takes place for both UV and visible light depending on work function.
Question 5
1 / -0

In Photoelectric effect

A
electrical energy is converted magnetic field energy

B
electrical energy is converted into heat

C
electrical energy is converted into light energy

D
light is converted into electrical energy

Solution

In photoelectric effect emission of photo-electron takes place, So that photo-current flows in circuit.
Question 6
1 / -0

In various experiments on photo electricity the stopping potential for a given frequency of the incident radiation

A
is proportional to radiation intensity

B
is independent of the radiation intensity

C
is inversely proportional to radiation intensity

D
is independent of radiation intensity

Solution

The stopping potential is defined as the potential necessary to stop any electron even the electron with the most kinetic energy from reaching the other plate. By changing radiation intensity only no.of emitted electron changes their Kinetic energy will not change.
Question 7
1 / -0

In various experiments on photo electricity dealing with the stopping potential dependence on frequency of incident radiation , the conclusion was that stopping potential

A
depends on the frequency

B
depends on the light intensity

C
depends on the initial current

D
is independent of frequency

Solution

The stopping potential is defined as the potential necessary to stop any electron even the electron with the most kinetic energy from reaching the other plate. Kinetic energy of electron depends on frequency not on intensity of incident radiation.

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Dual Nature of Radiation and Matter Test - 3

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Dual Nature of Radiation and Matter Test - 3

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Question 1

energy required by an electron to escape from the metal surface

maximum energy required by an electron to escape from the metal surface

minimum energy required by an electron to escape from the metal surface

energy required by an electron to get absorbed in the metal surface

Solution

Question 2

Illuminating a metal surface with suitable light

Heating the metal sufficiently

Applying a very strong electric field to a metal

Applying a very strong magnetic field to a metal

Solution

Question 3

emission of electrons by metals when illuminated by light of suitable frequency

emission of electrons by metals when heated

emission of electrons by glass when illuminated by light of suitable frequency

emission of electrons by insulators when illuminated by light of suitable frequency

Solution

Question 4

with only white light

with only ultraviolet

with both visible and uv depending on the metal

with only visible

Solution

Question 5

electrical energy is converted magnetic field energy

electrical energy is converted into heat

electrical energy is converted into light energy

light is converted into electrical energy

Solution

Question 6

is proportional to radiation intensity

is independent of the radiation intensity

is inversely proportional to radiation intensity

is independent of radiation intensity

Solution

Question 7

depends on the frequency

depends on the light intensity

depends on the initial current

is independent of frequency

Solution

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