ICS Part 2 Physics Chapter 21 Short Questions Preparation


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Physics - ICS Part 2 Physics Chapter 21 Short Questions Preparation

Question # 1

If nucleus has a life of one year,does this mean that it will be completely decayed after two years?

  • Ans 1: No it will not decay completely after two years.
    Numbers of atom at initial stage =No
    number of atoms decayed after first year =1/2No
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Prepare Complete Set Wise Questions For Chapter 10 "ICS Part 2 Physics Chapter 21 Short Questions Preparation "

ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 1

Question # 1

If nucleus has a life of one year,does this mean that it will be completely decayed after two years?

  • Ans 1: No it will not decay completely after two years.
    Numbers of atom at initial stage =No
    number of atoms decayed after first year =1/2No
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 2

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 3

Question # 1

Protons and neutron are formed by what types of quarks?

  • Ans 1: Protons is formed by two up and one down quarks.Neutron is formed by two down and one up quarks.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 4

Question # 1

What do you mean by critical mass and critical volume?

  • Ans 1: The mass of uranium in which one neutron out of all neutron out of all neutron produced in one fission reaction produces further fission reaction is called critical mass.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 5

Question # 1

Define background radiations.What are their sources?

  • Ans 1: When no radioactive source is placed near the radiations detector,it records radiations,These radiations are called background radiations.
    Its source are
    1. The cosmic rays which come to us from outer space.
    2. Radioactive substance present is the Earth's crest.
    3. Radioactive potassium and carbon in the body.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation