A total of 2.0 × 1013 electrons pass a given point in a wire in 15 s. What is the current in the wire? (e = 1.60 × 10-19 C)
A) 0.21 ?A B) 3.2 ?A C) 1.3 mA D) 1.3 A
A
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The current definition of the standard second of time is based on
A) the frequency of radiation emitted by cesium atoms. B) the earth's rotation rate. C) the duration of one year. D) the oscillation of a particular pendulum kept in France.
The outer core
A) has a plastic-like flow. B) flows fast enough to power Earth's magnetic field. C) is solid as a rock. D) transmits S-waves.
In a vacuum where air resistance is zero, which variable below has no effect on the final falling velocity of an object?
The Compton effect demonstrates
A) relativistic formulation works well. B) consistent explanations of scattered photon shift in wavelength. C) light acts as photons. D) all of the above. E) none of the above.