Ultrasound is used
a. to form images of internal organs
b. by bats to navigate
c. in automatic focus cameras
d. to control insects
e. all of the above
E
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Bats can detect small objects such as insects that are of a size on the order of a wavelength. If bats emit a chirp at a frequency of 60 kHz and the speed of soundwaves in air is 330 m/s, what is the smallest size insect they can detect?
a. 1.5 mm b. 3.5 mm c. 5.5 mm d. 7.5 mm e. 9.8 mm