Physics
State three factors on which the rate of emission of electrons from a metal surface depends.
Related Questions
(i) Which particles are responsible for current in conductors?
(ii) To which wire of a cable in a power circuit should the metal case of a geyser be connected?
(iii) To which wire should the fuse be connected?
(i) Explain the meaning of the statement 'current rating of a fuse is 5A'.
(ii) In the transmission of power, the voltage of power generated at the generating stations is stepped up from 11 kV to 132 kV before it is transmitted. Why?
Answer the following questions based on a hot cathode ray tube.
(i) Name the charged particles.
(ii) State the approximate voltage used to heat the filament.
(iii) What will happen to the beam when it passes through the electric field?
(i) What are free electrons?
(ii) Why do they not leave the metal surface on their own?
(iii) How can they be made to leave the metal surface? (State any two ways)