# A car is traveling towards an observer at a speed of 23m/s. The car sounds it’s horn which has a frequency of 400hz. If the air temperature that day was 17° c, what frequency did the observer hear?

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A car is traveling towards an observer at a speed of 23m/s. The car sounds it’s horn which has a frequency of 400hz. If the air temperature that day was 17° c, what frequency did the observer hear?

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Step 1

Standard form of Doppler equation is,

Step 2

Here, the car is the source and it moves towards the observer. It is assumed that the observer is at rest. The direction from source to listener is taken as positive.

So the above equation becomes,

Step 3

Substituting the...

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