Physics 2013 Waec Past Questions and Answers

Question 51 :

• WAEC 2013

A mass of 11.0 kg is suspended from a rigid support by an aluminum wire of length 2.0 m, diameter 2.0 mm and Young's modulus 7.0 x 10\(^{11}\) Nm\(^{-2}\). Determine the extension produced. [g = 10 ms\(^{-2}\); \(\pi\) = 3.142]

Question 52 :

• WAEC 2013

(a) What is a polarizer?
(b) With the aid of a diagram, explain how a polarizer can be used to polarize a beam of unpolarized light.

Question 53 :

• WAEC 2013

Name one use of 'LASER' in each of the following areas:
(a) communication;
(b) medicine;
(c) security

Question 54 :

• WAEC 2013

The accelerating potential in a cathode ray oscilloscope is 2.5 kV. Calculate the maximum speed of the accelerated electrons. [ e = 1.6 x 10\(^{-19}\) C; Me = 9.1 x 10\(^{-31}\) kg]

Question 55 :

• WAEC 2013

Write down the name of:
(a) two particles used in explaining the wave nature of matter;
(b) one device whose invention is based on the wave nature of matter.