Advertisements
Advertisements
प्रश्न
State three factors on which the rate of emission of electrons from a metal surface depends
Advertisements
उत्तर १
A rate of emission of electrons from a metal surface depends on
(1) Nature of the metal surface: Lower the work function of the metal, greater is the rate of emission of electrons from its surface.
(2) The temperature of the surface: Higher the temperature of the surface, greater is the rate of emission of electrons from the surface.
(3) Surface area of the metal: Larger the surface area of the metal emitting electrons, greater is the rate of emission of electrons.
उत्तर २
(i) The material of the surface,
(ii) The temperature of the surface,
(iii) The surface area of the surface.
APPEARS IN
संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
Why do Free electrons not leave the metal surface on their own
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?
Why should a radioactive substance not be touched by hands?
Define free electrons.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
A radioactive nucleus \[\ce{^A_ZX}\] undergoes spontaneous decay in the sequence \[\ce{^A_ZX -> _{Z-1 }B -> _{Z-3}C -> _{Z-2}D }\], where Z is the atomic number of element X. The possible decay particles in the sequence are ______.
The count rate of activity of a radioactive sample of a very large population decreased from 1024 to 128 in 3 minutes. Then the rate of disintegration at the end of 5 minutes is ______.
Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
