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
Answer: C
You might also like to view...
In the context of Uranus's rings, the passage of the planet in front of a star is referred to as a(n) _____
A) ablation B) blueshift C) occultation D) fasciculation
General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.
What will happen to Triton in the distant future, based on its present orbit?
What will be an ideal response?
Must acupuncture be responsible for the patients' recovery?
A) No. Acupuncture may be responsible for the healing, or it may not. Correlation does not necessarily imply causation. B) Yes. If the study was run by qualified M.D.s, then we should respect their findings that acupuncture cured these patients. C) No. Acupuncture is hippie, new age stuff, and is not respected by reputable doctors. D) Yes. The patients stated afterwards that they knew it had helped, and these people know their own bodies better than we do.