Waves

5 marks · Normal

A student is investigating water waves in a ripple tank and also observes how radio waves can transmit signals.

(a)

Describe how energy is transferred by waves in the ripple tank. State whether matter is transferred.

[2 marks]

(b)

Radio and water waves are types of waves. State one similarity and one difference between these two types of waves.

[2 marks]

(c)

Radio waves are part of the electromagnetic spectrum. Name one use of radio waves, and explain why they are suitable for this use.

[1 mark]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

(a) Waves transfer energy from one place to another without matter being transferred.

(b) Similarity: Both transfer energy; Difference: Water waves are mechanical and need a medium, radio waves are electromagnetic and can travel in a vacuum.

(c) One use: Radio broadcasting; radio waves can travel long distances and through the atmosphere, making them suitable for communication.

Common mistakes: Confusing energy transfer with matter movement; Stating both waves are the same type; Naming a use not linked to properties

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · States that waves transfer energy

B2 (a) · 1 mark · States that matter is not transferred

B3 (b) · 1 mark · States one valid similarity (e.g. both transfer energy/information)

B4 (b) · 1 mark · States one valid difference (mechanical vs electromagnetic/medium required)

B5 (c) · 1 mark · Names a valid use and links it to wave property (range/travel through atmosphere)

Worked solution

a) In the ripple tank, waves transfer energy from the point of disturbance outward with no net transfer of water: matter does not move from the source to the edge.

b) Similarity: Both radio and water waves transfer energy from one place to another. Difference: Water waves are mechanical and require a medium, while radio waves are electromagnetic and can travel through a vacuum.

c) Radio waves are used for broadcasting radio signals because they travel long distances and through the air, making them suitable for communication.