Bats Can Detect Small Objects Such as Insects That Are

Multiple Choice

Bats can detect small objects such as insects that are of a size approximately that of one wavelength.If bats emit a chirp at a frequency of 60 kHz,and the speed of sound waves in air is 340 m/s,what is the smallest size insect they can detect?
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A) 4.7 mm
B) 3.7 mm
C) 5.7 mm
D) 6.7 mm
E) ​7.7 mm