Question

Why does a siren have a higher pitch as it approaches you?

Answer 1

Answer:

Apparent Increase in Wave Frequency

As the ambulance approaches you, the distance between the source of the waves and the observer decreases. Consequently, the siren sounds more shrill as the pitch of the wailing siren 'sounds' higher than its original value, as sound waves reach you 'more frequently'.

Step-by-step explanation

hope this helps

Answer 2

Answer: C. The crests of the sound wave are spaced closer together.

Step-by-step explanation:I took the test.