A sound wave in air has a wavelength of 0.011 m. What is the frequency of this sound wave and is it audible to humans?
frequency: 30 Hz30\text{ Hz}30 Hz, audible to humans: yes
frequency: 30 Hz30\text{ Hz}30 Hz, audible to humans: no
frequency: 30 000 Hz30\,000\text{ Hz}30000 Hz, audible to humans: yes
frequency: 30 000 Hz30\,000\text{ Hz}30000 Hz, audible to humans: no
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.