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Edexcel A-Level Physics Standing Waves, Nodes and Antinodes

Practise Edexcel A-Level Physics standing waves through reflection and superposition, node and antinode labelling, phase relationships and string or air-column frequency.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • explain standing-wave formation from reflection and superposition of waves
  • label nodes and antinodes and describe amplitude or phase between sections
  • calculate wavelength or frequency for fixed strings and open air columns

2.3.41 - Standing waves, nodes and antinodes question 1

[Maximum number: 11]

A vibrating tuning fork is placed near to the open end of a tube that is closed at the other end, as shown.

Figure for Question 2.3.41 - Standing waves, nodes and antinodes question 1 — Edexcel A-Level Physics AS

Question (a)

(a)

Describe how a stationary wave is formed inside the tube.

[ 6 ]

Question (b)

(b)

When the length of the tube was 20.4 cm , the simplest possible stationary wave was formed inside the tube.

[ 5 ]

Question (i)

(i)

Calculate the frequency of the sound produced by the tube. speed of sound in air =340 m s−1=340 \mathrm{~m} \mathrm{~s}^{-1}

Frequency =
[ 3 ]

Question (ii)

(ii)

The actual frequency of the sound produced by the tube is slightly less than the calculated value.

Suggest why.

[ 2 ]
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