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

## Chapter 14: Dual Nature Of Radiation And Matter

MCQ’S

### 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

MCQ’S | Q 1

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

MCQ’S | Q 2

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.

MCQ’S | Q 3

The maximum kinetic energy of the photoelectrons depends only on ______

• potential

• frequency

• incident angle

• pressure

MCQ’S | Q 4

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

• moving neutral particles only.

• moving charged particle only.

• electrons only

• all moving matter particles

MCQ’S | Q 5

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

• 4000 Å

• 3500 Å

• 2959 Å

• 2500 Å

MCQ’S | Q 6

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

MCQ’S | Q 7

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 × 1010

• 2 × 107

• 2 × 105

• 2 × 10-5

### 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

Very Short Answer | Q 1

Define photoelectric effect.

Very Short Answer | Q 2

Define threshold frequency.

Very Short Answer | Q 3

What is cut-off or stopping potential?

Very Short Answer | Q 4

Define the work function of the metal.

Very Short Answer | Q 5

The minimum frequency for photoelectric effect on metal is 7 × 1014 Hz, Find the work function of the metal.

Very Short Answer | Q 6

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.

Very Short Answer | Q 7

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

Short Answer I | Q 1

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

Short Answer I | Q 2

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

Short Answer I | Q 3

What is mean by the dual nature of matter?

Short Answer I | Q 4

Explain the concept of the photoelectric effect.

Short Answer I | Q 5

If the total energy of radiation of frequency 1014 Hz is 6.63 J, Calculate the number of photons in the radiation.

Short Answer I | Q 6

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

Short Answer I | Q 7

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

Short Answer II | Q 1

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

Short Answer II | Q 2

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

Short Answer II | Q 3

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

Short Answer II | Q 4

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

Short Answer II | Q 5

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

Short Answer II | Q 6

The work function of a surface is 3.1 eV. A photon of frequency 1 × 1015 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.

## 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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