Compared to the energy it takes to separate oxygen and hydrogen from water, the amount of energy released when they recombine is
A) slightly more.
B) slightly less.
C) much more.
D) much less.
E) the same.
Answer: E
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A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground.
A. 44 m B. 14 m C. 74 m D. 30 m E. 60 m
Electrons in atoms move about the nucleus in well defined circular orbits
Indicate whether the statement is true or false
Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
When a positronium atom decays, it emits two photons. What are the energies of the photons?
A) 0.225 MeV and 0.285 MeV B) 0.511 MeV and 1.022 MeV C) 0.256 MeV and 0.256 MeV D) 0.511 MeV and 0.511 MeV E) 1.02 GeV and 938. MeV