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प्रश्न
Why do Free electrons not leave the metal surface on their own
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उत्तर
Free electrons cannot leave the metal surface on their own because they do not have sufficient kinetic energy.
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संबंधित प्रश्न
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
Name the unit in which the work function of a metal is expressed.
State any two precautions to be taken while handling radioactive substances
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?
A certain nucleus A (mass number 238 and atomic number 92) is radioactive and becomes a nucleus B (mass number 234 and atomic number 90) by the loss of one particle.
What particle was emitted?
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.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
State three common properties of beta rays and cathode rays.
State three ways of obtaining an electron-beam.
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.
