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Sam is walking through the park. He hears a police car coming down the street toward him. What happens to the sound of the siren as the police car approaches and then passes Sam?

Respuesta :

icedipping
The sound of the siren is higher pitched when the car approaches and is lower pitched once it passes Sam.

Answer:

Explanation:

When ever there is a relative motion between the source and the observer then there is an apparent change in the frequency of sound, this phenomenon is called doppler's effect.

When the car approaches Sam :-

In this condition velocity of observer is zero, i.e., vo = 0, the formula of doppler effect is given by

[tex]f' =\frac{v}{v-vs}\times f[/tex]

where, v be the speed of sound, vs be the speed of police car and f' be the frequency of sound which is observed.

So, according to the formula as the police car is approaching Sam, the frequency of sound increases.

When the car passes Sam :-

In this condition velocity of observer is zero, i.e., vo = 0, the formula of doppler effect is given by

[tex]f' =\frac{v}{v+vs}\times f[/tex]

where, v be the speed of sound, vs be the speed of police car and f' be the frequency of sound which is observed.

So, according to the formula as the police car is approaching Sam, the frequency of sound decreases.

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