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You are holding a siren, and you hear a frequency of 1200 Hz from it when you are standing still. You now move directly toward a cliff wall at a speed of 1/5 the speed of sound. What frequency do you hear as an echo from the cliff wall?

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okpalawalter8

Answer:

[tex]F_w=1000Hz[/tex]

Explanation:

From the question we are told that:

Frequency [tex]F=1200[/tex]

Speed [tex]V_w= \frac{1}{5}*343=>68.6m/s[/tex]

Where speed of sound [tex]V_s=343m/s[/tex]

Generally the equation for frequency  that echo from the cliff wall is mathematically given by

[tex]F_w=\frac{V_s-V_0}{Vs+V_w}*F[/tex]

[tex]F_w=\frac{343-0}{343+68.6}*1200[/tex]

[tex]F_w=1000Hz[/tex]

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