Advertisements
Advertisements
प्रश्न
What do you mean by Mass number.
Advertisements
उत्तर
Mass number is the sum of protons and neutrons present in the nucleus.
APPEARS IN
संबंधित प्रश्न
Why do Free electrons not leave the metal surface on their own
Under which conditions does the nucleus of an atom tend to radioactive?
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 are the uses of radioactive isotopes in following?
(a) Medical field,
(b) Agriculture,
(c) Industries?
A nucleus of an element X which has the symbol `""_84^202` X emits an alpha particle and then a beta particle. The final nucleus is `""_"b"^"a"` Y Find a and b.
Define bound electrons.
State two properties that a substance should possess when used as a thermionic emitter.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
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.
