ICS Part 2 Physics Chapter 20 Short Questions Preparation

Question # 1

What are the difference between laser light and ordinary light?

Ans 1: The laser light is intense ,unidirectional and phase coherent ,so it does bit spread as compared to ordinary light.
The energy of laser can be focused at a point to get enough heat for welding which is not possible with ordinary light.
A laser beam is used as a surgical tool for welding detached retina which ordinary light can not do.

Question # 2

What do you mean by inner shell transition?

Ans 1: A transition in which an electron from higher orbit,emits energy and accommodate a hole in the lower orbit.Such a transition is called inner shell transition.The photons emitted in such transition are called characteristic x-rays.

Question # 3

List of color of line spectra of an excited hydrogen atom.

Ans 1: The color of line spectrum of hydrogen atom are
- Red
- Blue
- Blue-Green
- Violet
- Ultraviolet

Question # 4

Write down use of laser in industry.

Ans 1: It can be used for telecommunication in fibre optics.
It is used to read bar codes,
It is used to generate 3D image of objects by holography.

Question # 5

Can the electron in the ground state of hydrogen atom absorb a photon of energy 13.6 eV greater than 13.6 eV?

Ans 1: Yes an electron in the ground state of hydrogen atom can absorb a photon of energy 13.6 eV and greater than 13.6 eV.
ionization energy of hydrogen atom in ground state is 13.6 eV.So if hydrogen absorb a photon of energy greater than 13.6 eV than the surplus energy of photon appear as K.E of electron

Question # 6

Distinguished between stimulated emission and spontaneous emission.

Ans 1: Stimulated emission: If a atom is excited for a longer lifetime of about 10^-3sec than an incident photon of energy equal to the difference of two energy levels induces the atom to decay by emitting a photon that travel in the direction of incident photon.This process is called stimulated or induced emission.
Ans 2: Spontaneous Emission: As excited is highly unstable with life time of
10^-8sec,so electron will de excite itself with emission of a photon in any arbitrarydirection is called spontaneous emission.

Question # 7

In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?

Ans 1: Balmer series falls in the visible region.
Lyman series falls in the ultraviolet region.

Question # 8

What is CAT scanner?

Ans 1: A vastly improved x-rays technique is computerized axial tomography: the corresponding instrument is called CAT scanner.In CAT scanning a number of different orientations.Computer is attached to construct picture,Density difference of the order of one percent can be detected,Tumors and other anomalies much too small to be seen with older techniques can be detected.

Question # 9

Can x-rays be reflected,diffracted polarized just like any other eaves?Explain

Ans 1: Yes x rays can be reflected,refracted diffracted by crystal only and polarized just like any other waves.

Question # 10

Write two properties of x-rays.

Ans 1:
1. They cause ionization.
2. They have very short wavelength.

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ICS Part 2 Physics Chapter 20 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

Online Short Questions For Chapter 9 "ICS Part 2 Physics Chapter 20 Short Questions Preparation "

Physics - ICS Part 2 Physics Chapter 20 Short Questions Preparation

What are the difference between laser light and ordinary light?

What do you mean by inner shell transition?

List of color of line spectra of an excited hydrogen atom.

Write down use of laser in industry.

Can the electron in the ground state of hydrogen atom absorb a photon of energy 13.6 eV greater than 13.6 eV?

Distinguished between stimulated emission and spontaneous emission.

In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?

What is CAT scanner?

Can x-rays be reflected,diffracted polarized just like any other eaves?Explain

Write two properties of x-rays.

Prepare Complete Set Wise Questions For Chapter 9 "ICS Part 2 Physics Chapter 20 Short Questions Preparation "

Set 1

Set 2

Set 3

ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 1

What are the difference between laser light and ordinary light?

What do you mean by inner shell transition?

List of color of line spectra of an excited hydrogen atom.

Write down use of laser in industry.

Can the electron in the ground state of hydrogen atom absorb a photon of energy 13.6 eV greater than 13.6 eV?

Distinguished between stimulated emission and spontaneous emission.

In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?

What is CAT scanner?

Can x-rays be reflected,diffracted polarized just like any other eaves?Explain

Write two properties of x-rays.

ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 2

Define normal population and population inversion.

What do we mean when we say that the atom is excited?

What is meant by line spectrum? How line spectrum can be used for the identification of elements?

How does a Kax-rays differ KbX-rays?

How can spectrum of hydrogen contain so many lines,whereas hydrogen atom contain one electron?

Define population inversion and metastable stable.

Is energy conserved when an atom emits a photon of light?

Can electron reside inside the nucleus?

Explain why laser action could not occur without population inversion between atomic levels?

What are the advantages of laser over ordinary light?

ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 3

Explain why laser action could not occur without population inversion between atomic levels?

Give two uses of laser in medicine and industry.

Write down use of laser in industry.

Can the electron in the ground state of hydrogen atom absorb a photon of energy 13.6 eV greater than 13.6 eV?

Briefly describe continuous x-rays.

What are the advantages of laser over ordinary light?

Bohr's theory of hydrogen atom is based upon several assumptions.Do any of these assumptions contradict classical physics?

Write use of x-rays.

In which region of electromagnetic spectrum does the following series fall (a)Lyman series (b)Balmer series?

What is CAT scanner?

ICS Part 2 Physics Chapter 20 Short Questions Preparation

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12th Class Physics
Short Questions Preparation

How does a K_ax-rays differ K_bX-rays?