Photons of wavelength ? scatter elastically from protons at rest. The wavelength of photons scattered at 90° is increased by:
1.?/137
2.h/2?c
3.h/(mec)
4.h/(mpc)
5.? cos(45°)
6.None of the above
4
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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.
Kepler developed his model of elliptical orbits because of an 8-arcminute discrepancy between observations and a model of planetary motion with circular orbits
Indicate whether the statement is true or false
Which of the following is not a unit of work?
a. ft • lb b. N • m c. joule d. watt
Rank the magnitudes of the forces exerted on the following particles from largest to smallest. In your ranking, display any cases of equality
(a) an electron moving at 1 Mm/s perpendicular to a 1-mT magnetic field (b) an electron moving at 1 Mm/s parallel to a 1-mT magnetic field (c) an electron moving at 2 Mm/s perpendicular to a 1-mT magnetic field (d) a proton moving at 1 Mm/s perpendicular to a 1-mT magnetic field (e) a proton moving at 1 Mm/s at a 458 angle to a 1-mT magnetic field
1.d > a = c > b > f 2.a > c > d > b = c 3.c > a = d > e > b 4.b > f > c > d > a 5.b > c > a > f > d