Which statement about infrasound is correct?
It has a lower frequency than audible sound, and it is a longitudinal wave.
It has a lower frequency than audible sound, and it is a transverse wave.
It has a higher frequency than audible sound, and it is a longitudinal wave.
It has a higher frequency than audible sound, and it is a transverse wave.
295 exam-style questions on CIE IGCSE Physics Sound, covering Sound. Each one has a worked solution and a mark scheme showing where the marks go.