A2640-hz sound source is moving at 15.0m/s toward a stationary observer. what is the frequency heard by the observer if the speed of sound is 343 m/s?

The frequency heard by the observer is 2760.73 hertz.                 Explanation:

Frequency of source, f = 2640 Hz

Velocity of source,

The speed of sound, v = 343 m/s

Let f' is the frequency heard by the observer. According to Doppler's effect, the frequency of the observer is given by :

(as the source is moving towards observer)

f' = 2760.73 Hz

So, the frequency heard by the observer is 2760.73 hertz. Hence, this is the required solution.                              

close lines strong magnet less close weaker

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.