Why is spectroscopy important to astronomers?
What will be an ideal response?
Virtually all the information we receive about the universe comes in the form of electromagnetic waves, such as light waves. Analyzing the light with spectroscopy can give us the temperature, composition, and motion of the source, so this is the basis of modern astrophysics.
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During the course of a single night, a planet that is moving in retrograde motion will move
A. east to west. B. not at all. C. west to east. D. randomly about the sky.
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is open,
A. bulb 1 is glowing; bulb 2 is dark. B. bulb 2 is glowing; bulb 1 is dark. C. both bulbs glow equally brightly. D. both bulbs glow one half as brightly as they do with the switch closed. E. both bulbs are dark.
What is the average power dissipation in a series RC circuit if R = 6.35 k?, C = 2.64 µF, and V = (192 V) cos 115t?
a. 2.29 W b. 5.81 W c. 2.90 W d. 3.23 W e. 6.47 W
The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million b. 3.8 million c. 3.5 billion d. 570 million