A water wave passes by a floating leaf that is made to oscillate up and down two complete cycles each second, which means that the wave's frequency is
A) 0.5 Hz.
B) 1 Hz.
C) 2 Hz.
D) 3 Hz.
E) 6 Hz.
Answer: C
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Meters: Decreasing the resistance of an ammeter's shunt resistance
A. allows it to measure a larger current at full scale deflection. B. allows it to measure a smaller current at full scale deflection. C. enables more current to pass directly through the galvanometer. D. converts it to a voltmeter.
Phil stands at rest with both feet on a scale that reads 500 N. When he gently lifts one foot, the scale reads
A) less than 500 N. B) 500 N. C) more than 500 N.
The cosmic microwave background gives us a view of the universe when it was
A) 380,000 years old. B) 14 billion years old. C) about 1 million years old. D) 3-5 minutes old.