ICS Part 2 Physics Chapter 20 Short Questions Preparation


12th Class Physics
Short Questions Preparation

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

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Physics - ICS Part 2 Physics Chapter 20 Short Questions Preparation

Question # 1

What are the advantages of laser over ordinary light?

  • Ans 1: Laser light has many advantages over ordinary light such as laser light is
    1. Coherent
    2. Intense
    3. Monochromatic
    4. Unidirectional
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Prepare Complete Set Wise Questions For Chapter 9 "ICS Part 2 Physics Chapter 20 Short Questions Preparation "

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

Question # 1

What are the advantages of laser over ordinary light?

  • Ans 1: Laser light has many advantages over ordinary light such as laser light is
    1. Coherent
    2. Intense
    3. Monochromatic
    4. Unidirectional
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ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 2

Question # 1

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

  • Ans 1: Bohr's first assumptions contradicts classical physics.Bohr said that electron do not radiate energy during revolving while according to classical physics,electron radiate energy during revolving and fall into the nucleus which is impossible.
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ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 3

Question # 1

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.
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20th Chapter

ICS Part 2 Physics Chapter 20 Short Questions Preparation

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