A remotely operated vehicle surveys a straight, flooded tunnel. The vehicle is 32.0 m from the tunnel entrance and sends an ultrasound pulse towards the closed end of the tunnel.
The vehicle displays a distance of 84.0 m to the closed end using a sound speed of 1500 m/s. The actual speed of sound in the water is 1470 m/s.
Calculate the length of the tunnel from the entrance to the closed end.
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.