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प्रश्न
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उत्तर
संबंधित प्रश्न
How can they be made to leave the metal surface? (State any two ways)
What is thermionic emission?
What kind of change takes place in a nucleus when a β -particle is emitted?
In following fig. shows a mixed source S of alpha and beta particles in a thick lead container. The particles pass through a magnetic field in a direction perpendicular to the plane of paper (inwards as shown by x). State and show in the diagram how the particles get affected.
Name two radioactive substances.
What are ‘Becquerel rays’?
It is advised not to touch a radioactive substance by hand. Give reason.
Unit of radioactivity is _______
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
Complete the following radioactive reaction:
\[\ce{^-_-X -> ^-_-Y + ^4_2He -> ^234_91Z + ^0_-1e}\]
