Which form of electromagnetic radiation is able to easily reach Earth's surface through an atmospheric window?
a. microwave
b. radio
c. X-rays
d. gamma
e. ultraviolet
b
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While observing the Sun, you note a large number of sunspots. What can you conclude?
A) The Sun is less luminous than usual. B) This is a period of low solar activity. C) Earth's climate will be unusually cold. D) The Sun's rotation is slower than average. E) There are likely to be an above average number of flares and prominences.
The allowed shapes for orbits under the force of gravity are
A) ellipses only. B) ellipses and spirals. C) ellipses, parabolas, and hyperbolas. D) ellipses, spirals, and parabolas. E) spirals, circles, and squares.
The Summer Triangle is formed by the stars Deneb, Vega, and Altair
Indicate whether the statement is true or false
In which system is heat usually transferred from the cooler part to the warmer part?
a. a stove as it heats up water b. a refrigerator that is running c. an electric fan that is running d. none of the above, because it is impossible to transfer heat in this manner