Which of the following frequencies is classified as ultrasound?
A
18 Hz18\text{ Hz}18 Hz
B
1.8 kHz1.8\text{ kHz}1.8 kHz
C
18 kHz18\text{ kHz}18 kHz
D
28 kHz28\text{ kHz}28 kHz
Markscheme
4.3 Sound, ultrasound and infrasound (physics only) Questions
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.