#waves

What inside a whistling kettle actually produces the sound as the water boils?

Why does thunder from a single lightning stroke sound like an extended rumble rather than one sharp bang?

Can a singer's voice alone, without amplification, really shatter a wine glass purely by resonance, as claimed in a famous old commercial?

Why does holding a seashell to your ear seem to produce a 'roaring ocean' sound, even far from the sea?

Why does dragging a moistened finger around the rim of a wine glass produce a sustained musical tone, and why does adding water to the glass change the pitch?

Why do certain sand dunes emit a loud, sustained musical 'booming' or 'singing' hum when sand avalanches down their slip face?

Sound waves from an elevated bell reach the ground, but the loudest point on the floor is not necessarily directly below the bell: where is it, and why?

Why does distant thunder sound like a long rolling rumble rather than a single sharp bang, even though the lightning stroke that causes it happens almost instantaneously?