How are low-mass red giant stars important to our existence?
A) These stars manufactured virtually all the elements out of which we and our planet are made.
B) These stars generate the energy that makes life on Earth possible.
C) These stars manufactured most of the carbon atoms in our bodies.
D) These stars provide most of the light that reaches us from globular clusters.
C
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Which of the following statements about Mars is not true?
A) We have landed spacecraft on its surface. B) It is considered part of our inner solar system. C) We could survive on Mars without spacesuits, as long as we brought oxygen in scuba tanks. D) It has some liquid water today, but used to have large amounts of flowing water.
The standard "picture" of the hydrogen atom as a tiny proton with an electron moving in an ellipse around it is extremely oversimplified. The main thing wrong with this picture is
A) the path is actually much more complicated than the elliptical path pictured. B) the electron should be pictured as a spread-out matter field. C) actually there are several electrons going around in the hydrogen atom D) the electron is actually much larger than the proton. E) Actually this picture is not oversimplified.
An organ pipe open at both ends has a radius of 4.0 cm and a length of 6.0 m. What is the frequency (in Hz) of the third harmonic? (Assume the velocity of sound is 344 m/s.)
a. 76 b. 86 c. 54 d. 28 e. 129
Beats: Two taut strings of identical mass per unit length are stretched with the same tension with their ends fixed, but one string is 0.330 cm longer than the other. Waves on these strings propagate at 34.0 m/s.The fundamental frequency of the shorter string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 12.3 Hz B. 9.00 Hz C. 12.0 Hz D. 12.7 Hz E. 11.3 Hz