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CAIE A-Level Physics AS 8.1.4 Wavelength May Be Determined From the Positions of Nodes or Antinodes of a Questions

Apply the principle of superposition to explain interference patterns produced by coherent waves.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Apply the principle of superposition to explain interference patterns produced by coherent waves.

CAIE A-Level Physics AS 8.1.4 Wavelength May Be Determined From the Positions of Nodes or Antinodes of a Questions question 1

[Maximum number: 1]

Two loudspeakers are connected to the same signal generator. The signal generator produces a single frequency. The loudspeakers face each other so that a stationary sound wave is set up in the region between the loudspeakers.

Figure for Question CAIE A-Level Physics AS 8.1.4 Wavelength May Be Determined From the Positions of Nodes or Antinodes of a Questions question 1 — CAIE A-Level Physics AS

A microphone is connected to a cathode-ray oscilloscope (CRO) and positioned between the two loudspeakers.

The microphone is moved along a line joining the two loudspeakers.
The signal on the CRO shows 5 maximum amplitudes as the microphone moves. The microphone moves a distance of 2.0 m from the position that gives the first maximum to the position that gives the fifth maximum.

What is the wavelength of the sound wave?

A

0.40 m

B

0.50 m

C

0.80 m

D

1.0 m1.0 \mathrm{~m}

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