Waves
5 marks · NormalA student is investigating water waves in a ripple tank and also observes how radio waves can transmit signals.
Describe how energy is transferred by waves in the ripple tank. State whether matter is transferred.
Radio and water waves are types of waves. State one similarity and one difference between these two types of waves.
Radio waves are part of the electromagnetic spectrum. Name one use of radio waves, and explain why they are suitable for this use.
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.
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(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.