Physics Past Questions and Answers

State;
(a) the difference between plane polarized light and ordinary light;
(b) two uses of polaroids.

Define
(a) electrolysis;
(b) electrolyte;
(c) electrode.

Copper of thickness d is plated on the cathode of a copper voltameter. If the total surface area of the cathode is 60 cm\(^2\) and a steady current of 5.0 A is maintained in the voltameter for 1 hour. calculate the value of d. [density of copper = 8.9 x 10\(^3\)kg m\(^{-3}\) electro chemical equivalent of copper = 3.3 x 10\(^{-7}\) kg C\(^{-1}\)

(a) Explain thermiopic emission
(b) State two applications of electrical conduction through gases.

A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the;
(a) stress on the wire;
(b) strain in, the wire. [\(\pi = 3.142\)]