When a proton and an antiproton collide
a. they destroy each other and produce energy in the form of gamma rays.
b. one of the protons is converted to a neutron and they form a nucleus consisting of one proton and one neutron.
c. one of the protons is converted to an electron and they form a hydrogen atom.
d. one proton is converted to a neutron and the other is converted to an electron.
e. A proton and an antiproton cannot collide because the Coulomb barrier is too great.
a
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Comets are largely made out of
A) rock and ice. B) hydrogen gas. C) rock. D) hydrogen compounds. E) metal.
According to scientists, the naturally occurring greenhouse effect makes Earth about 31?C warmer than it would be if there were no greenhouse gases in our atmosphere. How do scientists "know" what Earth's temperature would be without greenhouse gases?
a. Ancient fossils allow them to infer Earth's temperature at a time before our atmosphere contained greenhouse gases. b. They estimate it by averaging guesses made by many individual scientists. c. They assume that this temperature would be about the same as the temperature of Mars, which has much less of an atmosphere than Earth. d. They calculate this temperature from Earth's reflectivity and distance from the Sun.
How tall must a plane mirror be in order for you to be able to see your full image in it?
A) the same height as you B) 1/4 of your height C) half of your height D) 3/4 of your height E) twice your height
What is the unit of electric current?
a. The volt. b. The joule. c. The coulomb. d. The ampere. e. The watt.