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The spontaneous emission of radioactivit...

The spontaneous emission of radioactivity by unstable nuclei is called

A

positive radioactivity

B

artificial radioactivity

C

natural radioactivity

D

negative radioactivity

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The correct Answer is:
C
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The phenomenon of spontaneous emission of radiations is

Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. Choose the correct statemnet about radioactivity:

Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. n number of alpha -particels per second are being emitted by B atoms of a radioactive element. The half-life of element will be

Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. If T_(H) is the half-life and T_(M) is the mean life. Which of the following statement is correct.

A sudden spontaneous change in structure and action of a gene is called

The rate of emission of radiation, when a radioactive sample is placed in water,_________.

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CENGAGE CHEMISTRY-RADIOACTIVITY-MANDATORY EXERCISE (SET I)
  1. The relative atomic mass of an isotope of hydrogen containing two neut...

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  2. The elements which emit radioactivity are known as

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  3. The type of radiations emitted by radioactive substance are

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  4. The radiations emitted by different elements are

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  5. The spontaneous emission of radioactivity by unstable nuclei is called

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  6. In case of radioactive nucleus

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  7. Number of neutrons in element plutonium is ""(94)^(242)Pu

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  8. Which action will most increase a present exposure to radioactivity?

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  9. Which of the following have highest penetrating capacity

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  10. An atom of radium combines with two atoms of chlorine to form RaCl(2) ...

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  11. ""(6)^(11)C on decay produces

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  12. Isodiaphers are atoms having

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  13. A particle of mass m when annihilated completely gives energy E equal ...

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  14. ""^(23)Na is more stable isotope of Na. Find out the process by which ...

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  15. Which of the following isotopes is likely to be most stable

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  16. Neutrino was predicted to

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  17. Number of neutrons in a parent nucleus x, which gives ""(7)^(14)N afte...

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  18. Which of the following projectiles is the best for bombarding the nucl...

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  19. An alpha particle is also known as

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  20. When an alpha particle emitted from an unstable nucleus, the mass numb...

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