'In this "effect" first described in 1842, the pitch of a train whistle seems to change as it moves'
the Doppler effect
SCIENCE: In this effect first described in 1842, the pitch of a train whistle seems to change as it moves
In this "effect" first described in 1842, the pitch of a train whistle seems to change as it moves
In this "effect" first described in 1842, the pitch of a train whistle seems to change as it moves
SCIENCE
the Doppler effect
SCIENCE