College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

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Bats typically give off an ultrahigh-frequency sound at about 50 000 Hz. If a bat is approaching a stationary object at 18.0 m/s, what will be the reflected frequency it detects Assume the air in the cave is at 5 °C. [ Hint : You will need to apply the Doppler equations twice. Why ]