The Earth's atmosphere blocks most forms of electromagnetic radiation from entering except for ____________________ and ____________________
Fill in the blank(s) with correct word
visible light; radio waves
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Suppose you kick a soccer ball straight up to a height of 10 meters. Which of the following is true about the gravitational potential energy of the ball during its flight?
A) The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point. B) The ball's gravitational potential energy is greatest at the instant it returns to hit the ground. C) The ball's gravitational potential energy is always the same. D) The ball's gravitational potential energy is greatest at the instant the ball leaves your foot.
To say that an object becomes electrically polarized means that
A) it is electrically charged. B) its charges have been rearranged. C) its internal electric field is zero. D) it is only partially conducting. E) none of the above
The element with the most stable nucleus and smallest mass per particle is
A) uranium. B) argon. C) helium. D) hydrogen. E) iron.
What was one reason that RNA was eventually replaced by DNA as the molecule of choice for storing genetic information?
A) the bases that make up DNA became much more common B) DNA is far more stable than RNA C) DNA can catalyze its own replication D) the double helix of DNA is better able to correct errors in replication