Why are X-rays and gamma rays considered dangerous forms of light?
a. These forms of light are only produced by large, dangerous machines.
b. There is no form of protection from these forms of light
c. These forms of light break through Earth's atmosphere.
d. Photons of these wavelengths have high energy.
e. These forms of light cause sunburn.
d
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A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:
A) the ball becomes positively charged by induction B) the ball becomes negatively charged by induction C) the number of electrons in the ball is more than the number in the rod D) the string is not a perfect insulator E) there is a rearrangement of the electrons in the ball
What information does 21 cm radiation provide about the gas clouds?
A) their motion B) their distribution C) their density D) their temperature E) all of these
Based on human history, the likelihood that we will eventually colonize other habitable planets in our galaxy is
A) impossible to predict B) high C) zero D) low
If the Moon is rising at midnight, the phase of the Moon must be
A) first quarter. B) waxing crescent. C) third quarter. D) waning crescent. E) full.