Sundogs and halos of the Sun and the Moon are caused by:
a. refraction by the atmosphere.
b. refraction by water droplets.
c. reflection of the object in water.
d. scattering by molecules in the air.
e. refraction by atmospheric ice crystals.
e
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For main-sequence stars, which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.
Consider the n = 9 shell. (a) What is the largest value of the orbital quantum number, l, in this shell? (b) How many electrons can be placed in this shell?
What will be an ideal response?
While yet unproven, the proposed WIMPS would be:
A) massive like neutrons, but more elusive than neutrinos. B) made of only strong magnetic fields. C) rapidly decaying due to the weak nuclear force. D) changing charges and polarities too rapidly to pin down. E) the basic building blocks of neutrons and protons.
Which of the following measures would help reduce the need for new electric power plants?
A) Energy storage methods at electric power plants. B) More energy-efficient use of electricity. C) "Time-of-day"pricing that charges more for electricity at the "peak" times. D) All three of the above measures would help. E) Both measures A and C would help, but not B.