A field team uses an ultrasound pulse-echo instrument to measure the thickness of a glacier. The instrument assumes that sound travels through the ice at 3600 m/s and displays a thickness of 24.0 m.
A borehole drilled at the same point shows that the ice is actually 25.6 m thick.
What is the actual speed of sound in this ice?
1920 m/s1920\ \mathrm{m/s}1920 m/s
3375 m/s3375\ \mathrm{m/s}3375 m/s
3840 m/s3840\ \mathrm{m/s}3840 m/s
7680 m/s7680\ \mathrm{m/s}7680 m/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.