A(n) _______________ spectrum is produced by a hot, excited gas
Fill in the blank(s) with correct word
emission
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When the nuclear reactions begin making too little energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly. B) would reduce its central temperature. C) would increase its density. D) would increase the mass by a factor of 2.
If eclipses occur in repeatable patterns, then explain why an eclipse is not visible from the same place on Earth after one Saros cycle
What will be an ideal response?
You observe a full moon rising at sunset. What will you see 6 hours later?
A) a full moon on or near your meridian B) waning gibbous moon C) first-quarter moon D) a third-quarter moon
Why is the strange quark strange?
A.) It is more massive than any other kind of quark. B.) It is less massive than any other kind of quark. C.) It is blue. D.) It lives longer than we would expect. E.) It is charmed.