Two observers \(A\) and \(B\) are moving towards a stationary source of sound with speeds \(0.8v_0\) and \(0.6v_0\) respectively, where \(v_0\) is the speed of sound in air. The ratio of the frequencies of the sound heard by the observers \(A\) and \(B\) is
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For a moving observer and a stationary source,
\[
\boxed{
f'
=
f\left(\frac{v\pm v_o}{v}\right).
}
\]
Use the positive sign when the observer moves towards the source and the negative sign when moving away.