Bullet hitting banana. High speed photograph of a banana being hit by a .22 calibre bullet. The bullet is travelling at about 450 metres per second, around 1.4 times the speed of sound. The bullet entered the banana on its right, and exits in a cloud of banana froth at its left. This image was obtained by linking a flash to a microphone. The camera's shutter was opened in the dark, and the film was exposed as the flash fired. The flash, which lasted only around 1 microsecond, was triggered by the microphone detecting the bullet's shockwave as it left the gun.