___________is the breakdown of a polymer into simple molecules by bacteria.
Fill in the blank(s) with the appropriate word(s).
Biodegradation
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The wavelength of the hydrogen line from level 1 to level 2 in a hot star is ____________ the wavelength of the same line in a cool star. The stars have the same radial velocities away from Earth
a. larger than b. the same as c. smaller than d. not enough information to answer
When light travels from air into water, what happens to the speed of the wave?
A. Nothing, the speed of light is always constant. B. It depends on the angle of the light. C. The speed increases. D. The speed decreases.
According to the special theory of relativity, which of the following happens to the length of an object, measured in the dimension parallel to the motion of its inertial frame of reference, as the velocity of this frame increases with respect to a stationary observer?
a. the length remains constant b. the length vanishes to zero when velocity equals half the speed of light c. the length increases d. the length decreases
A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s2
a. 0.35 s c. 0.70 s b. 0.42 s d. 0.89 s