Doppler Effect Formula

Equation for calculate doppler effect is,

f = (c + v_r / c + v_s) × f₀

where,
c - is the velocity of waves in the medium
f₀ - emitted frequency
v_r - is the velocity of the receiver relative to the medium; positive if the receiver is moving towards the source
v_s - is the velocity of the source relative to the medium; positive if the source is moving away from the receiver
f - doppler effect observed frequency