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

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

Why are heavy nuclei unstable?

  • Ans 1: Heavy nuclei are unstable because their binding energy per nucleon is less than lighter nuclei.So less energy is required to break heavy nuclei and they become unstable.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 3

Question # 1

State two characteristics of beta particle.

  • Ans 1: They are negatively charged particle.
    Their penetration power is high.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 4

Question # 1

How can radioactivity help in the treatment of cancer?

  • Ans 1: It helps in treatment of cancer:
    1. Cobalt-60 is used in radiotherapy.
    2. For skin cancer ,phosphorus -32 or strontium-9 is used.
    3. Radioactive iodine-131 is used to cure cancer of thyroid gland.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 5

Question # 1

Why are heavy nuclei unstable?

  • Ans 1: Heavy nuclei are unstable because their binding energy per nucleon is less than lighter nuclei.So less energy is required to break heavy nuclei and they become unstable.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation

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