The Doppler effect is a characteristic of
A) water waves.
B) sound waves.
C) light waves.
D) all of the above
E) none of the above
Answer: D
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Gravitational lensing of distant, faint irregular galaxies may be the key to:
A) mapping the dark matter. B) quasar energy production. C) understanding galactic rotation curves. D) understanding active galactic nuclei. E) determining galactic redshifts.
Which of the following statements about the disk of the Milky Way is false?
A) The average age of disk stars is less than that of halo stars. B) Disk stars are all younger than 5 billion years. C) Disk stars have a higher proportion of heavy elements, on average, than halo stars. D) Disk stars orbit in the same direction around the Galactic center. E) The length of the disk is about 100 times its thickness.
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m2 sunlight. What is the efficiency of the solar cell?
A. 16% B. 7% C. 23% D. 4% E. 32%
The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is nuclear fusion
a. True b. False Indicate whether the statement is true or false