Dual Nature of Radiation and Matter

In the experimental study of photoelectric effect, the anode used is also referred to as collector.

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In the experimental study of photoelectric effect, the anode used is also referred to as collector.

The photoelectric effect occurs only when the incident light has more than a certain minimum ____.

Correct! Wrong!

The photoelectric effect occurs only when the incident light has more than a certain minimum frequency called threshold frequency.

In the experimental study of photoelectric effect, the photoelectric current can be varied by varying: (i) The potential of the collector plate with respect to the emitter (ii) The intensity of the incident light.

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In the experimental study of photoelectric effect, the photoelectric current can be varied either by varying the potential of the collector plate with respect to the emitter or by varying the intensity of the incident light.

In the experimental study of photoelectric effect the device used to change the polarity of the cathode and the anode plates is ___.

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In the experimental study of photoelectric effect the device used to change the polarity of the cathode and the anode plates is the commutator.

(i) In the experiment to study the photoelectric effect, when the accelerating potential across the emitter and collector plates is increased, the current in the micro-ammeter connected in the circuit increases. (ii) When the potential is increased, the number of electrons reaching the collector increases.

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In the experiment to study the photoelectric effect, when the accelerating potential across the emitter and collector plates is increased, the current in the micro-ammeter connected in the circuit increases. This is because; when the potential is increased, the number of electrons reaching the collector increases.

The scientists who investigated the phenomenon of photoelectric effect after Hertz were ____.

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Both Hallwachs and Lenard investigated the phenomenon of photoelectric effect after Hertz discovered it.

The experimental setup used by Heinrich Hertz to demonstrate the photoelectric effect consisted of ____.

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The experimental setup used by Heinrich Hertz to demonstrate the photoelectric effect consisted of both spark gap transmitter and receiver.

The negative potential given to the anode, at which the photoelectric current is zero, is called ____.

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The negative potential given to the anode, at which the photoelectric current is zero is called stopping potential.

Photoelectric current is directly proportional to the: (i) Frequency of the incident light (ii) Intensity of the incident light

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Photoelectric current is directly proportional to the intensity of the incident light. It does not depend on the frequency of the incident light.

In photoelectric effect an electron is able to escape from the metal surface only when it has kinetic energy sufficient to overcome the electrostatic attractive force.

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In photoelectric effect an electron is able to escape from the metal surface only when it has kinetic energy sufficient to overcome the electrostatic attractive force.

The electrons emitted from a metal surface by absorbing sufficient light energy incident on the surface are called ____.

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The electrons emitted from a metal surface by absorbing sufficient light energy incident on the surface are called photoelectrons.

According to Einstein’s theory of electromagnetic radiation energy is built of discrete units called quanta.

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According to Einstein’s theory of electromagnetic radiation energy is built of discrete units called quanta.

The minimum frequency of light required to emit photoelectrons from a metal surface is called ____.

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The minimum frequency of light required to emit photoelectrons from a metal surface is called threshold frequency.

A solar panel works on the principle of ____.

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A solar panel works on the principle of photoelectric effect.

The maximum kinetic energy of the photoelectrons that are ejected from a metal surface is: (i) dependent on the frequency of the incident light (ii) independent of the intensity of the incident light ____.

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The maximum kinetic energy of the photoelectrons that are ejected from a metal surface is dependent on the frequency of the incident light and is independent of its intensity.

Light consists of ____.

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Light consists of both electric and magnetic fields.

The maximum number of photo electrons released in a photocell is independent of ____.

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The maximum number of photo electrons released in a photocell is independent of frequency of the incident light.

The minimum frequency of incident radiation required to cause photoelectric emission from a metal surface is called ____.

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The minimum frequency of incident radiation required to cause photoelectric emission from a metal surface is called threshold frequency.

The phenomenon of photoelectric emission was discovered by ____.

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The phenomenon of photoelectric emission was discovered in 1887 by Heinrich Hertz

If the intensity of light is greater: (i) Greater is the amplitude of the electric field in light (ii) Greater is the amplitude of the magnetic field in light ____.

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If the intensity of light is greater, greater is the amplitude of its electric field and magnetic fields.

The maximum kinetic energy of the photoelectrons that are ejected from a metal surface is given by ____.

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The maximum kinetic energy of the photoelectrons that are ejected from a metal surface is given by eV0, where e is the charge on an electron and V0 is the stopping potential.

The phenomenon in which electrons are emitted from a metal surface after absorbing sufficient light energy is called photoelectric effect.

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The phenomenon in which electrons are emitted from a metal surface after absorbing sufficient light energy is called photoelectric effect.

Minimum frequency of incident light is required to emit photoelectrons from a metallic surface.

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The energy of the incident light is dependent on its frequency. Hence, a minimum frequency of incident light is required to emit photoelectrons from a metallic surface.

Wilhelm Hallwachs observed that when ultraviolet light was incident on a zinc plate which was positively charged ____.

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Wilhelm Hallwachs observed that when ultraviolet light was incident on a zinc plate which was positively charged, there was an increases in its positive charge.

(i) The potential difference between the cathode and the anode in the experimental set up to study photoelectric effect accelerates the electrons towards the collector plate. (ii) This potential difference is referred to as accelerating potential.

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The potential difference between the cathode and the anode in the experimental set up to study photoelectric effect accelerates the electrons towards the collector plate and hence this potential difference is referred to as accelerating potential.

In the experimental study of photoelectric effect, the photosensitive metal plate is called ____.

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In the experimental study of photoelectric effect, the photosensitive metal plate is called the cathode plate.

Which of the following category of light was used by Lenard in his experimental studies on photoelectric effect?

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Ultraviolet light was used by Lenard in his experimental studies on photoelectric effect.

Class 12th Physics - 11 Dual Nature of Radiation and Matter MCQs
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