An electric field of 4.0 mV/m is induced at a point 2.0 cm from the axis of a long solenoid (radius = 3.0 cm, 800 turns/m). At what rate is the current in the solenoid changing at this instant?
a. 0.50 A/s
b. 0.40 A/s
c. 0.60 A/s
d. 0.70 A/s
e. 0.27 A/s
B
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Matter Waves: An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 409 nm B. 302 nm C. 205 nm D. 420 nm E. 502 nm
On a warm day a pool of water transfers energy to the air as heat and freezes. This is a direct violation of:
A. the zeroth law of thermodynamics B. the first law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. none of the above
A heat engine in each cycle absorbs energy of magnitude |QH| as heat from a high temperature reservoir, does work of magnitude |W|, and then absorbs energy of magnitude |QL| as heat from a low temperature reservoir. If |W| = |QH| + |QL| this engine violates:
A. the zeroth law of thermodynamics B. the first law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. none of the above
According to the theory of cosmic inflation, at what time in the history of the universe did inflation occur?
A) at the very beginning of the big bang B) at the time that the cosmic background radiation formed C) around the third or fourth minute D) around the third or fourth second E) at a tiny fraction of the first second, but not quite at the very beginning of the big bang