The air on Mars is 95% nitrogen and argon
a. True
b. False
Indicate whether the statement is true or false
False
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Standing Waves on a String: A string fixed at both ends is vibrating in one of its harmonics. If we now increase only the frequency at which the string is vibrating, which of the following characteristics do we also increase? (There could be more than one correct choice.)
A. the speed of the traveling waves on the string B. the period of the traveling waves on the string C. the wavelength of the traveling waves on the string D. the amplitude of the traveling waves on the string E. None of these
The efficiency of a heat engine is given by the ratio of
A. net work done/amount of heat supplied B. net work done/amount of heat lost C. amount of heat supplied/amount of heat lost D. amount of heat supplied/new work done
The Babcock model explains:
A) the changes in the wavelengths of radiation. B) the process behind quantum jumps. C) how the Coulomb force helps in binding electrons to an atom. D) the reversal of the Sun's magnetic field from cycle to cycle.
Photoelectric Effect: Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 8.7 × 10-19 J B. 3.1 × 10-19 J C. 1.3 × 10-19 J D. 2.4 × 10-19 J E. 4.5 × 10-19 J