A girl blows a dog-training whistle that has a frequency of 25 000 Hz25\,000\text{ Hz}25000 Hz. Her friend, who has normal hearing, cannot hear the sound. What is the reason why the friend cannot hear the sound?
The amplitude is too large.
The amplitude is too small.
The frequency is too high.
The frequency is too low.
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.