Final answer:
Using the Doppler Effect formula, the frequency received by a person as an oncoming ambulance approaches, which is moving at 110 km/h and emitting a steady 825 Hz sound, is approximately 905 Hz.
Step-by-step explanation:
The student's question involves calculating the observed frequency of sound from an ambulance approaching a stationary listener, which is an application of the Doppler Effect. The Doppler Effect is observed when a source of sound is moving relative to an observer, causing a shift in the frequency heard by the observer.
To calculate the frequency received by the person, we will use the formula:
f' = f * ((v + vo) / (v - vs))
Where:
First, convert vs from km/h to m/s: 110 km/h * (1000 m/km) / (3600 s/h) = 30.56 m/s
Now, plug the values into the formula:
f' = 825 Hz * ((345 m/s + 0 m/s) / (345 m/s - 30.56 m/s))
f' = 825 Hz * (345 m/s / 314.44 m/s)
f' = 825 Hz * 1.097
f' ≈ 905 Hz
Therefore, the frequency received by the person as the ambulance approaches is approximately 905 Hz.