According to modern understanding, protons and neutrons are each composed of
A) three quarks.
B) three leptons.
C) two fermions.
D) four bosons.
A) three quarks.
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One unusual aspect of dark matter is
A) it exerts no gravitational force. B) it moves faster than lightspeed. C) it exerts a new kind of fundamental force, never observed before. D) it does not interact with electromagnetic radiation. E) its gravitational force pushes (or repels) instead of pulling.
What is the difference between forced and free convection?
What will be an ideal response?
In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?
A) -13.58 eV B) -6.79 eV C) -4.53 eV D) -3.40 eV E) -1.51 eV
When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of
A) hydrogen. B) helium. C) lithium. D) carbon. E) none of the above