Advertisements
Advertisements
प्रश्न
Why do Free electrons not leave the metal surface on their own
Advertisements
उत्तर
Free electrons cannot leave the metal surface on their own because they do not have sufficient kinetic energy.
APPEARS IN
संबंधित प्रश्न
An electromagnetic radiation is used for photography in fog. [2]
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
What do you mean by electron emission?
What are the types of emission?
Name the Different Radiations Which Are Emitted by the Radioactive Substances.
Are all the radiations mentioned by you, emitted in a single radioactive decay?
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z - 2}X + ^4_{2}He}\]
Which part of the atom undergoes a change in the process of radioactive decay?
Mention one important function of ear main parts:
State the principle on which the functioning of a nuclear reactor is based.
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.
