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Edexcel A-Level Physics AS 2.3.43 Core Practical 5 Vibrating String Frequency Questions

Practise Edexcel IAL Physics 2.3.43 by explaining vibrating-string frequency dependencies and confirming a signal-generator frequency from measured period.

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

Exam points

  • explain how string frequency depends on length, tension and mass per unit length, not amplitude
  • confirm signal-generator frequency by measuring period with oscilloscope or video

Edexcel A-Level Physics AS 2.3.43 Core Practical 5 Vibrating String Frequency Questions question 1

[Maximum number: 7]

A student investigated how the frequency of vibration of a string varies with the tension in the string. The student connected masses to one end of the string and attached the other end to a vibrator as shown.

Figure for Question Edexcel A-Level Physics AS 2.3.43 Core Practical 5 Vibrating String Frequency Questions question 1 — Edexcel A-Level Physics AS

A signal generator was connected to the vibrator. The signal generator was adjusted until a stationary wave was produced on the string. The stationary wave had nodes at both ends of the vibrating length of the string, L, and an antinode in the middle.

Question (a)

(a)

The student changed the weight W applied to the string and adjusted the frequency f of the signal generator until the same stationary wave was set up on the string.

The student plotted a graph of f2f^{2} against W.
Explain why the graph was a straight line through the origin.
(5)

[ 5 ]

Question (b)

(b)

Describe a method that can be used to confirm that the frequency value stated on the signal generator is correct.
(2)

[ 2 ]
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