Photon Momentum: What is the wavelength of a photon having the same momentum as an electron that is traveling at 7.5 km/s? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
Fill in the blank(s) with the appropriate word(s).
97 nm
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If a spherical convex mirror has a radius of curvature R, the magnitude of its focal length is
A) R/2. B) R/4. C) R. D) 2R. E) 4R.
Has Polaris always been a good "North Star"? Why or why not?
A) yes, because stars stay fixed on the celestial sphere B) no, because it is a young star which formed only a few hundred years ago C) no, because Earth's axis slowly changes the direction it points D) no, because ancient people did not know how to describe directions on Earth
What is the maximum theoretical efficiency possible for an engine operating between 
and 
A. 25%. B. 45%. C. 55%. D. 75%.
Which of the following is NOT a property of the outer planets?
A. They are composed mostly of hydrogen and helium. B. They all have solid surfaces for spacecraft to land on. C. They are all far more massive than Earth. D. They all have rings.