A sonar system sends one pulse every 0.20 s. The echo must return before the next pulse is sent. The speed of ultrasound in water is 1480 m/s.
Which is the greatest depth below the transmitter for which the echo returns before the next pulse?
150 m150\ \mathrm{m}150 m
280 m280\ \mathrm{m}280 m
140 m140\ \mathrm{m}140 m
300 m300\ \mathrm{m}300 m
112 exam-style questions on Edexcel GCSE Physics 4.3 Sound, ultrasound and infrasound, covering 4.3.1 Sound waves, vibrations and the human ear, 4.3.2 Ultrasound and infrasound, 4.3.3 Uses of ultrasound and infrasound, and 4.3.4 Sound waves passing between media. Each one has a worked solution and a mark scheme showing where the marks go.