Elementary Particles: What combination of quarks produces a neutron and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?
udd, with charges +2/3 e, -1/3 e, and -1/3 e
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What is the reason that it is so difficult to view Mercury from Earth?
A) Mercury is very dim. B) Mercury is very small. C) Mercury can't be seen at night. D) Mercury is often hidden by the Moon. E) Mercury is always very close to the Sun.
If you pitch a baseball with twice the kinetic energy you gave it in a previous pitch, the magnitude of its momentum is
A) 4 times as much. B) 2 times as much. C) doubled. D) times as much. E) the same.
For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 320 nm B) 340 nm C) 330 nm D) 350 nm
The hollow depression left when a shell or bone is dissolved completely out of a rock is called a(n)
a. groove. b. hole. c. cast. d. mold.