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प्रश्न
What are isobars?
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उत्तर
The atoms of different elements which have the same mass number 'A', but different atomic number 'Z' are called 'Isobars'.
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संबंधित प्रश्न
Name the unit in which the work function of a metal is expressed.
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.
What do you mean by Atomic mass
State the penetrating range of α, β and γ radiations.
Define the term radioactivity.
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
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.
What are cathode rays? Why are they called ‘cathode rays’? Name a material which exhibits fluorescence when cathode rays fall on it.
It is advised not to touch a radioactive substance by hand. Give reason.
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.
