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ratelena [41]
3 years ago
6

A stationary horn emits a sound with a frequency of 228 Hz. A car is moving toward the horn on a straight road with constant spe

ed. If the driver of the car hears the horn at a frequency of 246 Hz, then what is the speed of the car? Use 340 m/s for the speed of the sound
Physics
1 answer:
stiks02 [169]3 years ago
4 0

Answer: 26.84 m/s

Explanation:

Given

Original frequency of the horn f_o=228\ Hz

Apparent frequency f'=246\ Hz

Speed of sound is V=340\ m/s

Doppler frequency is

\Rightarrow f'=f_o\left(\dfrac{v+v_o}{v-v_s}\right)

Where,

v_o=\text{Velocity of the observer}\\v_s=\text{Velocity of the source}

Insert values

\Rightarrow 246=228\left[\dfrac{340+v_o}{340-0}\right]\\\\\Rightarrow 366.84=340+v_o\\\Rightarrow v_o=26.8\ m/s

Thus, the speed of the car is 26.84\ m/s

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