ICS Part 2 Physics Chapter 20 Short Questions Preparation


12th Class Physics
Short Questions Preparation

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12th Class Physics Chapter Wise Preparation

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

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

  • Ans 1: The single electron in hydrogen atom occupies ground state but it can be excited to several states by absorbing energy.During de-excitation ,it can emit several lines of different wavelength.
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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

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

  • Ans 1: The single electron in hydrogen atom occupies ground state but it can be excited to several states by absorbing energy.During de-excitation ,it can emit several lines of different wavelength.
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ICS Part 2 Physics Chapter 20 Short Questions Preparation - Set 2

Question # 1

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 - 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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ICS Part 2 Physics Chapter 20 Short Questions Preparation

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