Waves, Sound and Light — O/L Science

How do I practise Waves, Sound and Light?

1 question with a worked solution · 5 marks

1. 2021 · Paper II · 5 marks
   Question 6 gives a sound wave's frequency and its speed in air. It asks you to calculate the wavelength, to distinguish a transverse wave from a longitudinal wave and say which sound is, and to explain why sound cannot travel through a vacuum.
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   (i) λ = v / f = 340 / 440 ≈ 0.77 m (ii) Transverse wave — particles vibrate perpendicular to the direction of wave travel (e.g. light). Longitudinal wave — particles vibrate parallel to the direction of travel (e.g. sound). Sound is longitudinal. (iii) Sound requires a material medium (particles) to compress and rarefy. A vacuum has no particles, so sound cannot be transmitted.
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2021, Paper II, Question 6 · https://doenets.lk/pastpapers

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