An underwater beacon on a shipwreck emits sound with a frequency of 750 Hz. The sound travels through the seawater and into the steel hull of a salvage ship, where its speed is 6000 m/s.
Which gives the wavelength of the sound in the steel hull and the time the beacon takes to emit 150 complete oscillations?
0.13 m0.13\ \mathrm{m}0.13 m and 0.20 s0.20\ \mathrm{s}0.20 s
8.0 m8.0\ \mathrm{m}8.0 m and 5.0 s5.0\ \mathrm{s}5.0 s
8.0 m8.0\ \mathrm{m}8.0 m and 0.20 s0.20\ \mathrm{s}0.20 s
0.13 m0.13\ \mathrm{m}0.13 m and 5.0 s5.0\ \mathrm{s}5.0 s
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.