At what frequency is the reactance of a 20.0 mH inductor equal to 18.8 
A. 75.0 Hz
B. 150 Hz
C. 1500 Hz
D. 15.0 Hz
B. 150 Hz
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At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere
a. less intense b. more intense c. the same intensity
Suppose you are using the Doppler technique to look for planets around another star. What must you do?
A) Compare many spectra of an orbiting planet taken over a period of many months or years. B) Compare the brightness of the star over a period of many months or years. C) Carefully examine a single spectrum of an orbiting planet. D) Compare many spectra of the star taken over a period of many months or years.
Three terrestrial-sized planets in orbits of a fraction of an AU have been found near
A) a white dwarf. B) a millisecond pulsar. C) Supernova 1987A. D) Cygnus X-1. E) a magnetar.
Charm, beauty, and truth are three quantum numbers for quarks
a. True b. False Indicate whether the statement is true or false