Asked by: Sam Tuttle, Leicester
Sound is made up of vibrations, and as such is a source of energy that is capable of being converted into electricity. But while, say, a pneumatic drill sounds incredibly ‘powerful’ to us, that says more about how sensitive our ears are.
In reality, sound energy is far more dilute than the energy packed into sunlight, and thus very hard to exploit.
Get more fascinating Q&As from BBC Focus magazine by following @sciencefocusQA