The radius of the Bohr orbit for hydrogen with n = 3 is ______ time(s) that for the orbit with n = 1.
A. 1/3
B. 3
C. 6
D. 9
E. 18
D. 9
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Chloroplasts are found in the cells of which of the following organisms?
a. Clams b. Tulips c. Parrots d. Starfish
Standing Waves on a String: A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
A. 6.0 Hz B. 12 Hz C. 18 Hz D. 24 Hz E. 36 Hz
Why doesn't the uncertainty principle affect our ability to follow the path of a baseball?
A) The uncertainty principle applies only to subatomic particles. B) The uncertainties in all the individual atoms within the baseball cancel each other out. C) The uncertainties in the position and momentum of the baseball are so small in comparison to its size and total momentum that they are unnoticeable. D) The exclusion principle says that large objects are excluded from the consequences of the uncertainty principle. E) The uncertainty principle does not have anything to do with following the path of a particle or an object.
How long does it take an M-type star to reach the main sequence, compared to a solar-type star?
A) longer than the age of the Galaxy B) about twice as long C) a tenth as long D) about twenty times longer E) about the same, 30 million years