Sound travels through air at 343 m/s at $20^{\circ} C$ . A bat emits an ultrasonic squeak and hears the echo 0.05 s later. How far away was the object that reflected it?

7.5 m

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8.5 m

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9.5 m

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10.5 m

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Solution

The correct option is B $8.5 m$
Since the sound must travel to the object and back to the bat, we have 343 m/s × 0.05 s = 17 m and 17 m ÷ 2 = 8.5 m Hence, the object was at a distance of 8.5 m from the bat.

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Sound travels through air at 343 m/s at 20∘C. A bat emits an ultrasonic squeak and hears the echo 0.05 s later. How far away was the object that reflected it?

The correct option is B 8.5 mSince the sound must travel to the object and back to the bat, we have 343 m/s ×× 0.05 s = 17 m and 17 m ÷÷ 2 = 8.5 m Hence, the object was at a distance of 8.5 m from the bat.

Sound travels through air at 343 m/s at $20^{\circ} C$ . A bat emits an ultrasonic squeak and hears the echo 0.05 s later. How far away was the object that reflected it?

The correct option is B $8.5 m$
Since the sound must travel to the object and back to the bat, we have 343 m/s × 0.05 s = 17 m and 17 m ÷ 2 = 8.5 m Hence, the object was at a distance of 8.5 m from the bat.