Both electrons and protons have equal-magnitude
A) mass.
B) charge.
C) energy.
D) all of the above
E) none of the above
Answer: B
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Using the assumption that it takes several billion years for complex life to evolve in a stable environment, it is most likely that the stars with inhabited planets are:
A) G and K main sequence stars. B) white dwarf stars. C) A and B main sequence stars. D) neutron stars.
According to updated models of the formation of the Solar System, Earth's early atmosphere probably consisted mostly of:
A) hydrogen, ammonia, and methane. B) neon, argon, and radon. C) butane, ethane, and hexane. D) carbon dioxide, nitrogen, and water vapor.
The _____ is a band centered on the ecliptic and encircling the sky
A) nadir B) zodiac C) horizon D) zenith
Standing Sound Waves: An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the second harmonic of this pipe?
A. 213 Hz B. 425 Hz C. 638 Hz D. 850 Hz