The vast majority of stars in a newly formed star cluster are
A) very high-mass, type O and B stars.
B) red giants.
C) about the same mass as our Sun.
D) less massive than the Sun.
D
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Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
Heat normally flows from objects of high
A) internal energy to objects of low internal energy. B) temperature to objects of low temperature. C) both of these D) neither of these
A string with a mass per length of 2.00 g/m is stretched between two points that are 0.400 m apart. The second mode frequency of the stretched string is 50.0 Hz lower than the third mode frequency. What is the tension in the string?
A. 400 N B. 375 N C. 321 N D. 281 N E. 250 N
Which of the following could not be determined by an observation that uses only spectroscopy?
A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the size of a distant galaxy