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A source emits sound with a frequency of 860 Hz. It is moving at 20.0 m/s toward a stationary reflecting wall. If the speed of sound is 343 m/s, what frequency does an observer riding with the source hear

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Answer:

Explanation:

f = 860 Hz

velocity of  source, vs = 20 m/s

velocity of sound, v = 343 m/s

use the formula of doppler's effect

the frequency reflected from the wall is

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

[tex]f' = \frac{343}{343+20}\times 860[/tex]

f' = 812.62 Hz

Frequency heard by the observer

[tex]f'' = \frac{343}{343-20}\times 812.62[/tex]

f'' = 862.93 Hz

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