(a) What is meant by the wave-particles duality of matter?

(b) mention one physical phenomenon, in each case, that can be explained in terms of the wave nature and particle nature of light.

A simple pendulum makes 50 oscillations in one minute. Determine its period of oscillation

• A. 0.02s
• B. 0.83s
• C. 1.20s
• D. 50.00s

A particle dropped from a vertical height and falls freely for a time interval t. Sketch and explain a graph to show how h varies with (a) t (b) t\(^{2}\).

State the dimension of; (a) impulse; (ii) acceleration; (iii) work

A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms^-1, calculate the initial kinetic energy of the stone

• A. 200J
• B. 400J
• C. 800J
• D. 1600J

An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is

• A. 4.6v
• B. 6.0v
• C. 8.5v
• D. 12.0v

The heat capacity of a calorimeter is the amount of energy required to

• A. change the temperature of 1kg of the calorimeter by 1k
• B. change 1kg mass of the calorimeter to liquid at the same temperature
• C. change the temperature of the calorimeter
• D. melt the calorimeter into liquid at a constant temperature

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is

• A. 1:4
• B. 4:1
• C. 1:1
• D. 2:1

Satellite communication network makes use of?

• A. visible light
• B. sound wave
• C. radio wave
• D. infra-red wave

The resultant force in a couple is

• A. zero
• B. infinite
• C. the sum of the forces
• D. thr product of the forces