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प्रश्न
Unit of radioactivity is _______
विकल्प
roentgen
curie
becquerel
all the above
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उत्तर
All the above
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube
Name the charged particles
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
Give one example of isobars.
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
Define free electrons.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
From α, β and γ-rays, name the one which is not affected by electric or magnetic field?
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years will be ______.
