(a) List two types of waves, apart from light, that can be plane polarised

(b) State two applications of plane polarised light.

(a) State Hooke's law of elasticity

(b) A spiral spring, loaded with a piece of metal, extends by 10.5cm hair. When the metal is fully submerged in water, the spring extends by 6.8cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed).

(a) Explain electrolysis

(b) Classify the following substances as electrolytes and non-electrolytes: Sugar solution: paraffin, suit solution and grape fruit juice.

(a) State Heisenberg's uncertainty principle.

(b) Mention two phenomena that can only be explained in terms of the particulate nature of light.

(a) State the conditions for the equilibrium of a rigid body acted upon by parallel forces

(b)(i) Describe an experiment, using the principle of moments, to determine the mass of a metre rule

(ii) State two precautions necessary to ensure accurate results.

(c) A bullet of mass 120g is fired horizontally into a fixed wooden block with a speed of 20ms\(^{-1}\). The bullet is brought to rest in the block in 0.1s by a constant resistance. Calculate the:

(i) magnitude of the resistance;

(ii) distance moved by the bullet in the wood.