A student has an ultrasound transceiver device that emits short pulses of ultrasound and detects their reflections.
The device measures the time interval, ttt (in microseconds, μs\mu\text{s}μs), between emitting a pulse and detecting the reflected pulse.
Describe how the student can use this device to determine the speed of ultrasound in a long block of granite.
35 exam-style questions on Edexcel GCSE Physics 4.3 Sound, ultrasound and infrasound (physics only). Each one has a worked solution and a mark scheme showing where the marks go.