Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can.
b. Light goes faster than electricity.
c. They carry digital information. Wires can't carry digital information.
d. all of the above
a
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Find the average density of a red giant star with a mass of 20 × 1030 kg (approximately 10 solar masses) and a radius of 150 × 109 m (equal to the Earth's distance from the Sun).
A. 1.41 × 10?4 kg/m3 B. 0.007 kg/m3 C. 1.41 kg/m3 D. 710 kg/m3 E. 1.41 × 10?3 kg/m3
This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy. B) The clumps are regions of extremely strong x-ray emission. C) Each clump is the endpoint of one of the galaxy's spiral arms. D) The clumps are globular clusters orbiting the center of the galaxy.
The chromosphere is roughly _______________ times fainter than the photosphere
Fill in the blank(s) with correct word
The separation of different isotopes of a particular element can be difficult because
A. all isotopes are dangerous because of their radioactivity. B. the masses of the isotopes are the same. C. neutrons are so small. D. chemical reactions happen the same way for the isotopes.