An automatic focus camera is able to focus on objects by use of an ultrasonic sound wave. The camera sends out sound waves that reflect off distant objects and return to the camera. A sensor detects the time it takes for the waves to return and then determines the distance an object is from the camera. If a sound wave returns to the camera 0.150 seconds after leaving the camera, how far away is the object? (take speed of sound = 330 m/s)

40 m

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35.6 m

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30 m

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24.75 m

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Solution

The correct option is D
24.75 m

The speed of the sound wave is 330 m/s.
The distance can be found using, d = v $*$ t resulting in an answer of 24.75 m.
Use 0.075 seconds for the time since 0.15 seconds refers to the round-trip distance.

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The correct option is D 24.75 m The speed of the sound wave is 330 m/s. The distance can be found using, d = v ∗ t resulting in an answer of 24.75 m. Use 0.075 seconds for the time since 0.15 seconds refers to the round-trip distance.

The correct option is D
24.75 m

The speed of the sound wave is 330 m/s.
The distance can be found using, d = v $*$ t resulting in an answer of 24.75 m.
Use 0.075 seconds for the time since 0.15 seconds refers to the round-trip distance.