#### Chapters

Chapter 2: Mechanical Properties of fluids

Chapter 3: Kinetic Theory of gases and Radiation

Chapter 4: Thermodynamics

Chapter 5: Oscillations

Chapter 6: Superposition of Waves

Chapter 7: Wave Optics

Chapter 8: Electrostatics

Chapter 9: Current Electricity

Chapter 10: Magnetic Effect of Electric Current

Chapter 11: Magnetic materials

Chapter 12: Electromagnetic Induction

Chapter 13: AC Circuits

Chapter 14: Dual Nature Of Radiation And Matter

Chapter 15: Structure of Atoms and Nuclei

Chapter 16: Semiconductors Devices

## Chapter 14: Dual Nature Of Radiation And Matter

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 14 Dual Nature Of Radiation And Matter MCQ’S

#### 1 Mark Each

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

only if the frequency of radiation is above a certain threshold value.

only if the temperature of the surface is high.

at the that is independent of the nature of metal.

with a maximum velocity proportional to the frequency of incident radiation

As the intensity of incident light increases ______

photoelectric current increases

photoelectric current decreases.

the kinetic energy of emitted photoelectrons increases

the kinetic energy of emitted photoelectrons decreases.

The maximum kinetic energy of the photoelectrons depends only on ______

potential

frequency

incident angle

pressure

According to De-Broglie, the waves are associated with ______

moving neutral particles only.

moving charged particle only.

electrons only

all moving matter particles

The work function of a metal is 4.2 Ev. Its threshold wavelength will be ______

4000 Å

3500 Å

2959 Å

2500 Å

Ultraviolet radiation of 6.2 eV falls on an aluminum surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is ______

3.2 × 10

^{-21}3.2 × 10

^{-19}3.2 × 10

^{-1}3.2 × 10

^{-15 }

Planck's constant is 6.6 × 10^{-34} Js. The momentum of each photon is given radiation Is 3.3 × 10^{-2} kg/s. The λ of radiation is ______

2 × 10

^{10}m2 × 10

^{7}m2 × 10

^{5}m2 × 10

^{-5}m

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 14 Dual Nature Of Radiation And Matter Very Short Answer

#### 1 Mark Each

Define photoelectric effect.

Define threshold frequency.

What is cut-off or stopping potential?

Define the work function of the metal.

The minimum frequency for photoelectric effect on metal is 7 × 10^{14} Hz, Find the work function of the metal.

Find the kinetic energy of the emitted electron, if in photoelectric effect energy of incident Photon is 4 eV and work function is 2.4 eV.

Find the energy of photon which have momentum 2 × 10^{-16} gm-cm/sec.

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 14 Dual Nature Of Radiation And Matter Short Answer I

#### 2 Marks Each

Explain the term ‘wave-particle duality' of matter.

Draw a neat labelled diagram of a schematic of the experimental setup for the photoelectric effect.

What is mean by the dual nature of matter?

Explain the concept of the photoelectric effect.

If the total energy of radiation of frequency 10^{14} Hz is 6.63 J, Calculate the number of photons in the radiation.

An electron is accelerated through a potential of 120 V. Find its de Broglie wavelength.

Calculate the stopping potential when the metal with the work function 0.6 eV is illuminated with the light of 2 eV.

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 14 Dual Nature Of Radiation And Matter Short Answer II

#### 3 Marks Each

State Einstein photoelectric equation. Explain 2 characteristics of the photoelectric effect on the basis of Einstein’s photoelectric equation.

With the help of a circuit diagram describing an experiment to study the photoelectric effect.

What is the photoelectric effect? Define stopping potential and photoelectric work function.

Calculate De Broglie's wavelength of the bullet moving with speed 90m/sec and having a mass of 5 gm.

The energy of a photon is 2 eV. Find its frequency and wavelength.

The work function of a surface is 3.1 eV. A photon of frequency 1 × 10^{15} Hz. Is an incident on it. Calculate the incident wavelength is photoelectric emission occurs or not.

### SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 14 Dual Nature Of Radiation And Matter Long Answer

#### 4 Marks Each

With the help of a circuit diagram describe the experiment to study the characteristics of the photoelectric effect. Hence discuss any 2 characteristics of the photoelectric effect.

State Einstein’s photoelectric equation. Explain all characteristics of the photoelectric effect, on the basis of Einstein’s photoelectric equation.

Explain De Broglie’s Hypothesis.

## Chapter 14: Dual Nature Of Radiation And Matter

## SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 14 - Dual Nature Of Radiation And Matter

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Concepts covered in 12th Standard HSC Physics Maharashtra State Board 2021 chapter 14 Dual Nature Of Radiation And Matter are Dual Nature of Radiation and Matter, The Photoelectric Effect, Wave-particle Duality of Electromagnetic Radiation, Photo Cell, De Broglie Hypothesis, Davisson and Germer Experiment, Wave-particle Duality of Matter.

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