(4) Waves

Question 1

Explain the differences between an undamped progressive transverse wave
In terms of
Amplitude
Phase
Energy transfer

Answer 1

Amplitude: Progressive wave: constant amplitude;
Stationary wave: variable amplitude.

Phase: Progressive wave: points in phase; Stationary wave: points not in phase.

Energy Transfer: Progressive wave: energy is transferred through space
Stationary wave: no energy transfer through space

Question 2

Define Amplitude of Wave

Answer 2

Maximum Displacement from equilibrium

Question 3

Suggest one application of polarising filter and reason for its use (2marks)

Answer 3

Sunglasses: Reduce glare

Camera: Enhance Image

Question 4

Define Frequency of Wave

Answer 4

Complete number of oscillations per second

Question 5

A steel string is plucked at its centre
Explain why a stationary wave is formed on the string

Answer 5

Progressive wave travels from centre to ends and reflects

Two progressive waves travel in opposite directions along the string

Waves have the same amplitude

Hence superposition