Are these practice questions for Dual Nature Of Radiation And Matter based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 12 - Science Physics exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Dual Nature Of Radiation And Matter free?

Yes. Every chapter includes free practice questions for Class 12 - Science students to get you started.

What types of questions are included?

The practice set for Dual Nature Of Radiation And Matter mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Dual Nature Of Radiation And Matter for full coverage.

How many practice questions are there for Dual Nature Of Radiation And Matter?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Dual Nature Of Radiation And Matter Class 12 Physics Practice Questions with Answers

easy

The threshold wavelength for photoelectric emission from a certain metal is

600 \text{ nm}

. Solve for the work function of the metal in electron volts (eV).

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easy

Define the term 'threshold frequency'.

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easy

List the three primary physical processes that can cause electron emission from a metal surface.

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easy

Justify why the stopping potential in a photoelectric experiment is independent of the intensity of the incident radiation, based on the photon picture of light.

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easy

Evaluate the effect on the energy of individual photons in a monochromatic light beam if its intensity is doubled.

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easy

If the intensity of monochromatic radiation incident on a photosensitive surface is doubled, analyze the resulting change in the stopping potential and the saturation current.

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easy

Calculate the momentum of a photon corresponding to red light with a wavelength of

650 \text{ nm}

.

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easy

Identify the particle that represents a quantum of electromagnetic radiation.

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easy

Two metals, Tungsten (

\phi_0 = 4.5 \text{ eV}

) and Caesium (

\phi_0 = 2.14 \text{ eV}

), are considered for use as a filament in a vacuum tube for thermionic emission. Justify which metal would require a higher temperature to achieve significant thermionic emission and explain why.

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easy

A scientist claims to have deflected a beam of photons using a strong uniform magnetic field. Critique this claim.

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easy

Recall the de Broglie relation for the wavelength of a moving particle.

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easy

Define the work function of a metal.

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medium

Analyze why the wave theory of light fails to explain the instantaneous nature of the photoelectric effect.

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medium

A laser emits monochromatic light of frequency

5.0 \times 10^{14} \text{ Hz}

at a power of

3.0 \times 10^{-3} \text{ W}

. Calculate the number of photons emitted by the source per second.

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medium

Calculate the de Broglie wavelength of an electron that has been accelerated from rest through a potential difference of

100 \text{ V}

.

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medium

Examine the graphical representation of stopping potential (

V_0

) versus frequency (

\nu

) for photoelectric emission from two different metals, A and B. What physical quantities do the slope and the x-intercept of these graphs represent, and how do they compare for the two metals?

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medium

Explain two reasons why the classical wave theory of light failed to explain the photoelectric effect.

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medium

Apply Einstein's photoelectric equation to determine if a silver surface, with a work function of

4.7 \text{ eV}

, will exhibit photoelectric emission when illuminated by ultraviolet light of wavelength

250 \text{ nm}

.

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medium

Formulate the relationship between the threshold wavelength (

\lambda_0

) and the work function (

\phi_0

) of a metal. Using this, propose a reason why alkali metals are suitable for photoelectric experiments using visible light, while metals like zinc require ultraviolet light.

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medium

Light of wavelength

450 \text{ nm}

is incident on a metal surface with a work function of

2.20 \text{ eV}

. Calculate the stopping potential required to stop the emission of photoelectrons.

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medium

Demonstrate how Einstein's photoelectric equation,

K_{\text{max}} = h\nu - \phi_0

, logically leads to the concept of a threshold frequency.

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medium

A student argues, 'The wave theory of light can still explain the photoelectric effect if we consider that electrons need time to accumulate enough energy from a continuous wave. The instantaneous emission is just an experimental limitation.' Critique this argument based on the established observations of the photoelectric effect.

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medium

Justify the statement: 'The wave nature of matter is universal, but its effects are only significant for sub-atomic particles.' Support your justification with a comparative calculation for an electron moving at

10^6 \text{ m/s}

and a cricket ball of mass

150 \text{ g}

moving at

30 \text{ m/s}

.

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medium

Recall the de Broglie wavelength formula and calculate the wavelength for an electron having a momentum of

5.0 \times 10^{-24} \text{ kg m/s}

. (Use

h = 6.63 \times 10^{-34} \text{ J s}

)

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medium

List any three properties of photons.

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medium

Recall Einstein's photoelectric equation and explain each term in the equation.

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medium

Recall the formula for the energy of a photon and calculate it for a light of frequency

5.0 \times 10^{14} \text{ Hz}

. (Use Planck's constant

h = 6.63 \times 10^{-34} \text{ J s}

)

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medium

A photon of wavelength

\lambda

is completely absorbed by a stationary electron. Formulate an expression for the momentum transferred to the electron. Justify why, despite having no rest mass, a photon possesses momentum.

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medium

In a photoelectric effect experiment, the stopping potential is measured to be

1.8 \text{ V}

. Solve for the maximum speed of the emitted photoelectrons.

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medium

Explain the term 'stopping potential' in the context of the photoelectric effect.

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medium

Evaluate the statement: 'An experiment can simultaneously demonstrate both the wave and particle nature of light.' Justify your position with reference to phenomena like the photoelectric effect and Young's double-slit experiment.

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medium

Propose a simple conceptual design for a device that utilizes field emission. Explain the underlying principle and justify why a very strong electric field, typically of the order of

10^8 \text{ V/m}

, is necessary for this process.

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medium

Describe how the photoelectric current and the stopping potential are affected when the intensity of incident radiation is increased, while its frequency is kept constant and above the threshold frequency.

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medium

In a photoelectric effect experiment, the stopping potential (

V_0

) versus frequency (

\nu

) data for two different photosensitive materials, M1 and M2, are plotted. The work function of M1 is

\phi_1

and M2 is

\phi_2

, with

\phi_1 > \phi_2

. Create a single graph showing the expected plots for both M1 and M2. Justify the key features of your graph, including the slopes and the x-intercepts (threshold frequencies).

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hard

Summarize the key experimental observations of the photoelectric effect.

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hard

An electron and a proton have the same de Broglie wavelength. Analyze which particle has a higher kinetic energy and by what factor.

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hard

The work function of a metal is

2.0 \text{ eV}

. Recall the formula for threshold frequency and calculate its value. (Use

1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}

and

h = 6.63 \times 10^{-34} \text{ J s}

)

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hard

Compare and contrast the effect of increasing the intensity versus increasing the frequency of incident radiation on the photoelectric effect, assuming the initial frequency is above the threshold frequency.

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hard

Two different metals, Metal A (work function

\phi_A = 2.5 \text{ eV}

) and Metal B (work function

\phi_B = 4.5 \text{ eV}

), are illuminated by the same monochromatic light source of wavelength

400 \text{ nm}

. Evaluate which metal will emit photoelectrons with greater maximum kinetic energy. Justify your conclusion with detailed calculations.

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hard

An electron, a proton, and an alpha particle are all accelerated through the same potential difference,

V

. Evaluate and compare their resulting de Broglie wavelengths. Propose a mathematical relationship to show which particle will have the longest wavelength and which will have the shortest.

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hard

Compare the de Broglie wavelengths of a

0.15 \text{ kg}

cricket ball moving at

30 \text{ m/s}

and an electron moving at the same speed. Analyze why the wave nature of the cricket ball is not observable.

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hard

Explain the concept of the dual nature of matter as proposed by Louis de Broglie. Why is this wave nature not apparent for macroscopic objects?

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hard

Propose a method to control the de Broglie wavelength of an electron beam. Derive a formula that relates the de Broglie wavelength (

\lambda

) of an electron to the potential difference (

V

) used to accelerate it from rest. Evaluate the potential difference required to produce an electron beam with a de Broglie wavelength of

0.1 \text{ nm}

.

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hard

Examine the relationship between the de Broglie wavelength (

\lambda

) and the kinetic energy (

K

) of a non-relativistic particle. Demonstrate mathematically whether

\lambda

is inversely proportional to

K

or to

\sqrt{K}

.

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hard

Design an experiment to verify the relationship between the stopping potential (

V_0

) and the frequency (

\nu

) of incident radiation. Your design should include a labeled diagram of the setup, the procedure, and a justification for how the collected data would be used to determine Planck's constant (

h

) and the work function (

\phi_0

) of the emitter material.

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Dual Nature Of Radiation And MatterClass 12 Physics Practice Questions