The time for a planet to revolve around the Sun is its ________
Fill in the blank(s) with correct word
orbital period or year
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When the isotope bismuth-213 emits an alpha particle, what new element results?
A) lead B) platinum C) polonium D) thallium
If the following generic atom were to undergo ionization, what would be the charge of most likely product?
A) +3 B) -3 C) -5 D) 8 E) would probably not ionize
The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. Which hypothetical observation (these are not real observations) would call our current theory into question?
A) the discovery of a galaxy with a helium abundance of only 10% by mass B) the discovery of a star-like object made almost entirely of carbon and oxygen C) the discovery of a planet that with no helium in its atmosphere D) the discovery of a galaxy with 27% helium by mass
Luminosity (absolute brightness) of a star depends on its ________.
A. temperature and radius B. radius and distance C. mass and age D. distance and mass E. age and temperature