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CSEC Physics · January 2012 · Paper 2 · Question 6(b)(ii)

In 2010, SONAR was used to detect submerged oil plumes. Figure 7 shows a ship using SONAR to locate an oil plume.

If echoes are received 0.3 seconds after being sent, calculate the depth of the oil plume below the detector, given that Velocity = distance / time. [Speed of sound in sea water = 1450 ms⁻¹] [Speed of light in air = 3.0 × 10⁸ ms⁻¹]

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Other parts of this question

  1. 6(a)(i)What is the difference between 'longitudinal waves' and 'transverse waves'?[2 marks]
  2. 6(a)(ii)Given that red light has a wavelength of 700 × 10⁻⁹ m, calculate its frequency.[4 marks]
  3. 6(b)(i)Explain, with reference to Figure 7, how SONAR was used to determine the depth of an oil plume.[4 marks]

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