X-ray telescopes are located in orbit around the Earth because:
A) X-ray telescopes on Earth would have to be too big.
B) X-ray telescopes are cheap and easy to launch into space.
C) there are too many X-ray telescopes on Earth, so now they are put in space.
D) X-rays don't reach the surface of Earth.
E) the X-rays that come out of the telescopes are dangerous to humans.
D
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Two strings are, respectively, 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
a. 0.800, 0.670, 0.500 b. 1.33, 1.00, 0.500 c. 2.00, 1.00, 0.500 d. 2.00, 1.33, 1.00 e. 4.00, 2.00, 1.00
Mafic definition
What will be an ideal response?
What determines if a star becomes a white dwarf, a neutron star, or a black hole?
A) the principal factor is mass B) the principal factor is density C) the principal factor is temperature D) the principal factor is luminosity
The graph below indicates the temperature of Saturn's atmosphere as a function of distance from the upper cloud layer. Water will condense to form droplets at a temperature of approximately 270 K in the atmosphere of Saturn. At what distance from the upper cloud layer will clouds of water vapor form?
a.
-250 km
b.
-150 km
c.
0 km
d.
150 km
e.
250 km