What happens when a particle of matter and its corresponding particle of antimatter meet?
A) No one knows, since antimatter is only theoretical and not known to really exist.
B) The particles join together to make an antimatter atom.
C) The particles collide and then bounce back apart.
D) The particle and the antiparticle are annihilated, turning all their mass into energy.
E) They live happily ever after.
D) The particle and the antiparticle are annihilated, turning all their mass into energy.
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If two objects are electrically attracted to each other,
A) both objects must be negatively charged. B) both objects must be positively charged. C) one object must be negatively charged and the other object must be positively charged. D) one of the objects could be electrically neutral. E) None of the above statements are absolutely true.
Which of the following best describes the meaning of the uncertainty principle as applied to an electron bound in an atom?
A) The electron follows a precise path around the nucleus, but it is impossible for us to actually measure this path. B) The electron is actually a precisely defined sphere surrounding the nucleus rather than a point, which explains why we cannot locate it at a single position. C) The electron always has a clearly defined position and velocity, but the laws of nature are set up so that, if we measure one, the other becomes instantly hidden from view. D) The electron does not really exist, and what we perceive as an electron is really just an ill-defined energy field. E) The electron is both a particle and a wave and is therefore "smeared out" around the nucleus.
The flux density divided by the applied magnetic field strength is equal to the magnetic _________.
Fill in the blank(s) with the appropriate word(s).
What is hydrostatic equilibrium and how is it used to explain the internal stability of a star?
What will be an ideal response?