What are wavefronts?
3 marks · NormalThe diagram shows a wave travelling along a rope.
Mark and label the amplitude (A) and the wavelength (λ) on the diagram.
State what is meant by amplitude.
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) — · must show A vertical arrow from rest position to crest or trough labelled A, A horizontal arrow crest-to-crest or trough-to-trough labelled λ
(b) Amplitude is the maximum displacement of a particle from its rest position.
Must show: Amplitude measured from equilibrium to crest/trough; Wavelength from crest to crest or trough to trough
Common mistakes: Measuring amplitude crest to trough; Not marking wavelength as one complete cycle
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Labels amplitude correctly on the diagram (correct vertical distance).
B2 (a) · 1 mark · Labels wavelength correctly on the diagram (one full cycle, crest to crest or trough to trough).
B3 (b) · 1 mark · Defines amplitude correctly.
Worked solution
Amplitude is the maximum distance a particle moves from its rest position.