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 50 kHz, and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect?
a. 1.5 mm
c. 5.5 mm
b. 3.7 mm
d. 6.6 mm
D
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The distribution of Population II stars and globular clusters shows the Galaxy was more ________ in shape when it formed than it is now
Fill in the blank(s) with correct word
Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 mN, what is the greater of the two currents?
a. 0.20 A b. 0.40 A c. 40 mA d. 20 mA e. 0.63 A
Leavitt's law is a relationship between
A) a Cepheid variable star's period and luminosity. B) a galaxy's distance and recession speed. C) a galaxy's distance and redshift. D) a main-sequence star's color and luminosity.
Of all the planets, only ________ has surface features easily seen from Earth with even amateur telescopes
Fill in the blank(s) with correct word