Mind Blown

Doppler effect

motion squeezes/stretches wavelength, so a moving source sounds/looks shifted.

Source board

This definition comes from the board below. Open it to see the term in context.

Why the Siren Drops as It PassesMind Blown

More terms from this board

Redshiftlight stretched (moving away). Blueshift = squeezed (coming closer). Cosmic speedometer.