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Question 18N.2.SL.TZ0.4a

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.SL.TZ0.4a
Level SL Paper 2 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 2]
18N.2.SL.TZ0.4a

A pipe is open at both ends. A first-harmonic standing wave is set up in the pipe. The diagram shows the variation of displacement of air molecules in the pipe with distance along the pipe at time t = 0. The frequency of the first harmonic is f.

(a)

An air molecule is situated at point X in the pipe at t = 0. Describe the motion of this air molecule during one complete cycle of the standing wave beginning from t = 0.

[2]

Markscheme

«air molecule» moves to the right and then back to the left ✔

returns to X/original position ✔

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