Physics Past Questions and Answers

Which of the following statements about a progressive mechanical wave is correct?

A It can be a plane polarised
B Its energy is localised at specific points of its profile
C It does not require a material medium for its propagation
D Its frequency remains constant as it travels between different media

Question 1042:

The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms^-1, calculate its period

A 4.00s
B 2.50s
C 0.25s
D 0.04s

Question 1043:

Radio waves travel in air at 3.0 x 10⁸ms^-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water

A 4.33 x 10⁸ms^-1
B 4.00 x 10⁸ms^-1
C 2.25 x 10⁸ms^-1
D 1.33 x 10⁸ms^-1

Question 1044:

The amplitude of a wave is the

A Distance travelled by the wave in a complete cycle of its motion
B Maximum diplacement of the wave particle from the equilibrum position
C Separation of two adjacent particles vibrating in a phase
D Distance between two successive troughs of the wave

Question 1045:

Which of the following optical instruments does not depend on the use of plane mirrors?

A Kaleidoscope
B Simple microscope
C Sextant
D Simple periscope