A light bulb designed for use with AC would still work if hooked up to DC of the proper voltage
a. True
b. False
Indicate whether the statement is true or false
True
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Energy Levels: The shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 12, is closest to which one of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 92 nm B. 82 nm C. 72 nm D. 62 nm E. 52 nm
At the time the hypothesis was suggested, what major problem was identified with the idea that the Sun was powered by gravitational contraction?
A) This process would power the Sun for only about 25 million years, but geologists already had evidence the Earth was much older than that. B) This process could not possibly lead to the observed power output of the Sun. C) 19th century astronomers should have been able to measure the required change in the Sun's size. D) Contracting objects cool down rather than heat up.
In comparing vibrational and rotational levels in molecules, we find that the energy separation between adjacent energy levels is
a. the same in rotational and vibrational levels. b. greater in rotational than in vibrational levels. c. greater in vibrational than in rotational levels. d. directly proportional with one rotational level for each vibrational level. e. inversely proportional with one rotational level for each vibrational level.
A 2.0-kg ball is moving with a constant speed of 5.0 m/s in a horizontal circle whose diameter is 1.0 m. What is the magnitude of the net force on the ball?
A) 0 N B) 20 N C) 40 N D) 50 N E) 100 N