REVISION SOUND

𝑓 𝐿 = 𝑣± 𝑣 𝐿 𝑣± 𝑣 𝑆 𝑓 𝑆 DOPPLER EFFECT Doppler effect as the change in frequency (or pitch) of the sound detected by a listener because the sound source and the listener have different velocities relative to the medium of sound propagation 𝑓 𝐿 = 𝑣± 𝑣 𝐿 𝑣± 𝑣 𝑆 𝑓 𝑆

Speed of sound in medium Speed of sound in medium FORMULA Speed of sound in medium Speed of listener 𝑓 𝐿 = 𝑣± 𝑣 𝐿 𝑣± 𝑣 𝑆 𝑓 𝑆 Frequency of source Frequency of listener Speed of source Speed of sound in medium

+ - 𝑓 𝐿 = 𝑣± 𝑣 𝐿 𝑣± 𝑣 𝑆 𝑓 𝑆 Apart

+ - 𝑓 𝐿 = 𝑣± 𝑣 𝐿 𝑣± 𝑣 𝑆 𝑓 𝑆 toward each other

ELECTROMAGNETIC SPECTRUM light waves It does NOT need a medium to propagate It consists of seven main groups

DOPPLER EFFECT with LIGHT

DOPPLER EFFECT with LIGHT

DOPPLER EFFECT with LIGHT

DOPPLER EFFECT with LIGHT

GENERAL DOPPLER EFFECT

CHANGES IN FREQUENCY

a)

b)