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3 marksPhysical Quantities

CAPE Physics Unit 1 · 2011 · Paper 2 · Question 2(b)(ii)

The frequency f of a vibrating string is given by f = (1/(2l)) * sqrt(T/μ), where T is tension, μ is mass per unit length, and l is length. The tension T is kept constant at 100 N. The string's length is varied to tune it to tuning forks, and the results are in Table 2.

On page 9, plot a graph of frequency f vs 1/l.

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Other parts of this question

  1. 2(a)(i)Describe and explain what is heard at a certain level as the water runs out at the lower end.[2 marks]
  2. 2(a)(ii)What name is given to this phenomenon?[1 mark]
  3. 2(b)(i)Complete the table by filling in the values for 1/l.[1 mark]
  4. 2(b)(iii)Use the graph to determine the frequency of an unmarked fork which was in tune with 41.7 cm of the string.[2 marks]
  5. 2(b)(iv)Calculate the gradient of the graph.[3 marks]
  6. 2(b)(v)Determine the value of the mass per unit length, μ, of the wire.[3 marks]

More practice: the rest of this paper · more Physical Quantities questions · all CAPE Physics Unit 1 past papers