DP Physics (first assessment 2025)

Question 21N.1A.HL.TZ0.14

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.1A.HL.TZ0.14
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	14	Adapted from	N/A

14.

[Maximum mark: 1]

21N.1A.HL.TZ0.14

A travelling wave on the surface of a lake has wavelength $λ$ . Two points along the wave oscillate with the phase difference of $π$ . What is the smallest possible distance between these two points?

A. $\frac{λ}{4}$

B. $\frac{λ}{2}$

C. $λ$

D. $2 λ$

[1]

Markscheme

Syllabus sections

C. Wave behaviour » C.2 Wave model

Question 21N.1A.HL.TZ0.14

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