Compared with the spectral lines in the solar spectrum, lines in a supergiant star's spectrum are
a. more narrow.
b. broader.
c. weaker.
d. stronger.
e. broader and weaker.
a
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Explain why it is a common misconception to believe that life on Earth exists because of the presence of oxygen
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A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8 b. 1.7 c. 1.3 d. 4.0 e. 1.0
The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is
A) 1000 N. B) 2000 N. C) 3000 N. D) 4000 N. E) 5000 N.
O-type stars
A) have lifetimes long enough for advanced life to evolve B) have lifetimes long enough for planets to form and for life to appear, but not long enough for advanced life C) do not contain enough heavy elements to form planets D) have lifetimes too short for planet formation