ICS Part 2 Physics Chapter 21 Short Questions Preparation


12th Class Physics
Short Questions Preparation

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Physics - ICS Part 2 Physics Chapter 21 Short Questions Preparation

Question # 1

Wh Geiger counter is not suitable for fast counting?

  • Ans 1: Geiger counter is not suitable for fast counting because of its longer dead time.The positive ions take several time as long to reach the outer cathode,because positive ions are very massive than the electrons.During this time further incoming particle can not be counted,This time is called as the dead time of counter which delays fast counting system.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 1

Question # 1

Wh Geiger counter is not suitable for fast counting?

  • Ans 1: Geiger counter is not suitable for fast counting because of its longer dead time.The positive ions take several time as long to reach the outer cathode,because positive ions are very massive than the electrons.During this time further incoming particle can not be counted,This time is called as the dead time of counter which delays fast counting system.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 2

Question # 1

How energy released when 1 amu converted into energy?

  • Ans 1: 1 amu= 1.66 x10-27kg

    the energy of 1 amu is 1 amu =1.494 x10-10J
    1 amu= 931 MeV
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 3

Question # 1

Define absorbed dose and Gray.

  • Ans 1: Absorbed dose:It is defined as the amount of energy absorbed from an ionizing radiation per unit mass of the absorbing body i.e.
    Absorbed dose=energy/mass
    Gray: it is defined as the amount of energy equal to one joule absorbed by a body of mass 1kg i.e
    gray=1 joule/1 kg
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 4

Question # 1

What do you know about Radioactivity?

  • Ans 1: The elements having charge number Z>82 are unstable and they emit invisible radiations which affect the photographic plate.Such element are called radioactive elements and this process is called radioactivity.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 5

Question # 1

What is radioactivity decay?Give an example.

  • Ans 1: The emission of radiations from elements having charge number Z greater than 82 is called radioactivity or radioactive decay.
    The emission of an a-particle from radium-226 ,result in the formation of radon gas.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation