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A 500 Hz whistle is moved toward a listener at a speed of 10 m/s. At the same time, the listener moves at a speed of 20 m/s in a direction away fromm the whistle. What is the apparent frequency heard by the listener? (the speed of sound is 340 m/s)
A) 473 hz
B) 376 hz
C) 485 hz
D) 533 hz
E) 547hz

Respuesta :

Answer:

Frequency will be 485 Hz

So option (c) will be the correct option

Explanation:

We have given frequency f = 500 Hz

Velocity of observer [tex]v_o=20m/sec[/tex]

Velocity of source [tex]v_s=10m/sec[/tex]

When both observer and source are moving then frequency is given by

[tex]f'=\frac{v-v_o}{v-v_s}\times f[/tex] , here v is the velocity of sound

So [tex]f'=\frac{340-20}{340-10}\times 500=485Hz[/tex]

So option (c) will be the correct option

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