As far as we know all forms of life on Earth use ____________ as a medium for chemical reactions
a. gaseous helium
b. gaseous helium
c. frozen carbon dioxide
d. liquid water
e. frozen water
d
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On a planet whose Moon is in the same orbital plane as the planet's orbit around itsstar, how often will solar eclipses occur?
a) Twice every orbit of its moon (twice a month). b) Once every orbit of the planet around its Sun (its year). c) Twice every rotation of the planet (twice a day). d) Once every orbit of its moon (its month). e) Once every rotation of the planet (its day).
Two waves are described by ? y1 = 6cos(180t) and y2 = 6cos(186t) (both in meters). ? With what angular frequency does the maximum amplitude of the resultant wave vary with time?
A. 366 rad/s B. 6 rad/s C. 3 rad/s D. 92 rad/s E. 180 rad/s
Fraunhofer lines are apparent in
A) absorption spectra. B) emission spectra. C) Doppler shifts. D) a variety of energy levels. E) none of the above
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs glow equally brightly.
d.
bulb 1 goes out.
e.
bulb 2 goes out.