The two forms of electromagnetic radiation that penetrate the atmosphere best are:
A) X-rays and gamma rays.
B) ultraviolet and visible light.
C) visible and infrared light.
D) visible and radio waves.
E) infrared and microwaves.
D
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All galaxies beyond those local to the Milky Way appear to be receding from us
Indicate whether the statement is true or false
Distinguish between ac and dc. When you plug a light bulb into a wall outlet, where is the source of electrons?
What will be an ideal response?
How can we tell that some stars are relatively close to us in the sky?
a. Some stars are occasionally eclipsed by the Moon, so they must be nearby. b. Some stars vary in brightness caused by sunspots we can see because they are so close. c. Some stars appear to be extremely bright and must therefore be very close to us. d. Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.
The decay of a sample of radioactive atoms is studied by observers moving in different ways. One moves at 0.8c, another at 0.5c, another at 0.25c, and one at speed zero with respect to the sample. The one with a speed of ________ will measure the shortest half-life.
Fill in the blank(s) with the appropriate word(s).