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CAIE A-Level Physics 8.1.2 Demonstrating Stationary Waves

Practise interpreting stationary-wave experiments with microwaves, strings or air columns, identifying resonance, nodes, antinodes and assumptions.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • describe an experiment demonstrating stationary waves with microwaves, a stretched string or an air column
  • identify the apparatus, observations and resonance or node/antinode measurements in a stationary-wave experiment
  • use the stated assumptions, including negligible end correction where relevant, when interpreting the experiment

8.1.2—Experiments that demonstrate stationary waves using microwaves, stretched question 1

[Maximum number: 2]

A tube is open at both ends. A loudspeaker, emitting sound of a single frequency, is placed near one end of the tube, as shown in Fig. 3.1.

Fig. 3.1

Fig. 3.1

The speed of the sound in the tube is 340 ms−1340 \mathrm{~ms}^{-1}. The length of the tube is 0.60 m .
A stationary wave is formed with an antinode A at each end of the tube and two antinodes inside the tube.

Determine the minimum frequency of the sound from the loudspeaker that produces a stationary wave in the tube.
minimum frequency = Hz

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