An ultrasound sensor is fixed at the top of a storage silo. It sends a pulse downwards and detects the echo reflected from the surface of the flour.
The echo is detected 0.032 s after the pulse is sent.
The speed of sound in air is 340 m/s.
Calculate the distance from the sensor to the surface of the flour.
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.