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JAMB Physics 2003 Question 19

Question 19

Sound

Given that Young's modulus for aluminium is 7.0 × 1010Nm−2 and density is 2.7 × 103kgm−3, find the speed of the sound produced if a solid bar is struck at one end with a hammer.

  1. A.5.1 × 103ms−1
  2. B.4.2 × 103ms−1
  3. C.3.6 × 103ms−1
  4. D.2.8 × 103ms−1
Show the answer and explanation

Answer: A (5.1 × 103ms−1)

Explanation

v = √(E/ρ) = √(7.0 × 1010 ÷ 2.7 × 103) ≈ 5.1 × 103 m s−1.