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IB Physics SL C 4 3 Strings and Pipes Questions

Practise IB Physics SL C.4.3 by calculating harmonics and frequencies in strings and open or closed pipes using their boundary conditions.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • Calculate harmonic frequencies and wavelengths for strings fixed at both ends.
  • Use open and closed pipe boundary conditions to identify allowed harmonics and resonances.
  • Relate wave speed, length and harmonic number to standing-wave frequency.

Learn this topic

Study C.4.3—Strings and pipes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics SL C 4 3 Strings and Pipes Questions question 1

[Maximum number: 3]

Question (a)

(a)

A loudspeaker emits sound of frequency 210 Hz into a pipe with one open and one closed end. The diagram shows a representation of the standing wave established in the pipe.

Figure for Question (a) — IB Physics SL
[ 1 ]

Question (i)

(i)

Determine the wavelength of the wave.

[ 1 ]

Question (b)

(b)

The frequency of sound is reduced to 140 Hz . Explain why a standing wave will not be formed in the pipe.

[ 2 ]
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