An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. Selecting the longest wavelength that will work from the those given below, what wavelength is needed if a photon accomplishes this task?
a. 60 nm
b. 80 nm
c. 70 nm
d. 90 nm
e. 40 nm
D
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Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. The Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.
In modern astronomy, an interferometer
a. is the highest resolution optical telescope ever built. b. is located in Arecibo, Puerto Rico. c. is a set of optical telescopes linked together to provide very high resolution. d. is a set of radio telescopes linked together to provide very high resolution. e. is either a set of optical telescopes linked together to provide very high resolution or is a set of radio telescopes linked together to provide very high resolution.
A heat engine with an efficiency of 30% performs 2500 J of work. How much heat is discharged to the lower temperature reservoir?
A) 7100 J B) 8300 J C) 750 J D) 5800 J E) 1400 J
A 2.00-kg block of ice is at STP (0°C, 1 atm) while it melts completely to water. What is its change in entropy? (For ice, Lf = 3.34 × 10^5 J/kg)
a. zero c. 1220 J/K b. 584 J/K d. 2450 J/K