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प्रश्न
Why should a radioactive substance not be touched by hands?
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उत्तर
Radioactive substance should not be touched by hands because these radiations are harmful; when radiation falls on the human body, they kill the human living tissues and cause radiation burns.
संबंधित प्रश्न
How can they be made to leave the metal surface? (State any two ways)
An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.
Find the atomic number and atomic mass of the element S.
Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.
1) Name the radiation B which is unaffected by the electrostatic field.
2) Why does the radiation C deflect more than A?
3) Which among the three causes the least biological damage externally.
4) Name the radiation which is used in carbon dating.
What do you mean by electron emission?
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.
Reason (R): Rutherford did α-particles scattering experiment.
