What is a stratosphere?
A) a lowest layer in the atmosphere
B) a part of the atmosphere that absorbs optical light
C) a part of the atmosphere that absorbs ultraviolet light
D) a part of the atmosphere that absorbs x-rays
E) the highest layer in an atmosphere
B) a part of the atmosphere that absorbs optical light
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Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease. b. The greenhouse effect would be more efficient and the temperature of Earth would increase. c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll. d. Ultraviolet radiation from the Sun would bombard Earth. e. none of the above
Projectile Motion: At target practice, a rifle bullet is fired at an angle of 30° below the horizontal with an initial velocity of 800 m/s from the top of a cliff 80 m high. How far from the base of the cliff does it strike the level ground below if air resistance is negligible?
Fill in the blank(s) with the appropriate word(s).
Refraction results from changes in light's
A) frequency. B) incident angles. C) speed. D) all of the above E) none of the above
Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton