Based solely on an understanding of the greenhouse effect (as displayed in the figure), which one of the following statements is true?
a. We do not yet understand the greenhouse effect well enough to make predictions about how it affects our planet.
b. Global warming poses a grave threat to our future.
c. We should expect an increase in the greenhouse gas concentration to lead to global warming.
d. Humans are causing global warming.
Answer : c. We should expect an increase in the greenhouse gas concentration to lead to global warming.
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What produces the afterglow of a gamma-ray burst?
a) Collisions between planets and stars. b) Repeated explosions of the central star. c) Gradual escape of particles from a central black hole. d) X-rays travel more slowly through space than other types of radiation so they producean afterglow. e) Collision of expanding stellar material with gas and dust in the interstellar medium.
The radioactive decay of cobalt 56 into iron 56 affects the light curve of a type I supernova about ________ after the initial peak in luminosity
Fill in the blank(s) with correct word
We often find dark nebulae associated with bright H II regions
Indicate whether the statement is true or false
Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?
a. 30° b. 60° c. 45° d. 53° e. 75°