Which of the following are candidates for galactic dark matter?
A) faint red stars
B) brown dwarfs
C) Jupiter-size objects
D) WIMPs
E) all of the above
E
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Two different continuous water waves on the surface of a pond would be expected to have roughly the same
A) amplitude. B) frequency. C) wavelengths. D) wave speeds. E) energy.
What is the wavelength of the line in the Balmer series of hydrogen that is comprised of transitions from the n = 5 to the n = 2 level? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 304 nm b. 434 nm c. 476 nm d. 95 nm e. 333 nm
A nuclear reaction is said to be endothermic if the total kinetic energy is
A) less after the reaction than before. B) equal both before and after the reaction. C) greater after the reaction than before. D) zero after the reaction.
Why will girls wearing gym shoes win in a tug-of-war against boys wearing socks while the activity occurs on a smooth floor?
What will be an ideal response?