In order for an atom to decay to an element that is one greater in atomic number, it can emit
A) one alpha particle and 3 beta particles.
B) one positron and 2 beta particles.
C) one beta particle.
D) all of the above
E) none of the above
Answer: D
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Measuring the changing light output of a star to search for exoplanets is called ________.
A. spectroscopy B. the Doppler method C. the transit method D. gravitational lensing
The evening sunsets are reddish orange because the atmosphere
A. absorbs blue light. B. is more efficient at scattering blue light. C. contains small amounts of red dust that give the air its red color. D. absorbs the red light. E. is most efficient at scattering red light.
At 10°C, which is more concentrated—a saturated solution of sodium nitrate, NaNImage, or a saturated solution of sodium chloride? (See figure shown above.)
A) At 20°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl. B) At 10°C a saturated solution of sodium chloride, NaCl, is more concentrated than a saturated solution of sodium nitrate, NaNImage. C) At 10°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl. D) At 25°C a saturated solution of sodium nitrate, NaNImage, is more concentrated than a saturated solution of sodium chloride, NaCl.
The force that keeps your feet from sliding as you walk is
a. centripetal force. b. weight. c. kinetic friction. d. static friction. e. none of the above.