(a) Answer the following questions based on a hot cathode ray tube :

1.	(a) 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 ? (b) State three factors on which the rate of emission of electrons from a metal surface depends. (c) (z) 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)
Answer» (a) (i) Electrons. (ii) 5 to 6 V. (iii) It is deflected by the electric field. (b) (i) Nature of the metallic surface (ii) Temperature of the metal surface and (iii) Surface area of the metal surface. (c) (i) These are the electrons which are not bound to the nucleus and are free to move in the metal. (ii) Because it finds itself being pulled by the positive charge left behind as it becomes. (iii) They can be made to leave the metal surface by (z) Thermionic emission (heating the metal surface) (ii) Photoelectric emission (By shining a radiation of sufficient frequency on the metal surface).

(a) 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 ? (b) State three factors on which the rate of emission of electrons from a metal surface depends. (c) (z) 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)

Answer»

(a) (i) Electrons.

(ii) 5 to 6 V.

(iii) It is deflected by the electric field.

(b) (i) Nature of the metallic surface

(ii) Temperature of the metal surface and

(iii) Surface area of the metal surface.

(c) (i) These are the electrons which are not bound to the nucleus and are free to move in the metal.

(ii) Because it finds itself being pulled by the positive charge left behind as it becomes.

(iii) They can be made to leave the metal surface by (z) Thermionic emission (heating the metal surface)

(ii) Photoelectric emission (By shining a radiation of sufficient frequency on the metal surface).