Advertisements
Advertisements
Question
State three factors on which the rate of emission of electrons from a metal surface depends
Advertisements
Solution 1
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.
Solution 2
(i) The material of the surface,
(ii) The temperature of the surface,
(iii) The surface area of the surface.
APPEARS IN
RELATED QUESTIONS
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
What are isobars?
Give a scientific explanation.
When the radiation coming out from a certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
State two properties that a substance should possess when used as a thermionic emitter.
How is a cathode ray beam affected while passing through a magnetic field?
How is a cathode ray tube used to convert an electrical signal into a visual signal?
A radioactive material decays by simultaneous emissions of two particles with half-lives of 1400 years and 700 years respectively. What will be the time after which one-third of the material remains? (Take In3 = 1.1)
