Which of the following is not a meson?
a. the phi
c. the pion
b. the kaon
d. All of the above are mesons.
D
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The quark structure of the neutron is udd
Indicate whether the statement is true or false
The rotation curve of a galaxy can be used to determine
a. the relative number of hot young stars in the galaxy. b. the relative amount of gas and dust in the galaxy. c. the radius of the galaxy. d. the luminosity of the galaxy. e. the mass of the galaxy.
Suppose we know a particle’s four-momentum pt and px components. If we draw the particle’s four-momentum arrow on an energy–momentum diagram, we can use a hyperbola to determine
A. The particle’s energy.
B. The particle’s speed.
C. The particle’s x-velocity.
D. The particle’s momentum magnitude 
.
E. The particle’s mass.
F. The scaling on the t axis.
T. Something else (specify).
A water bug on the surface of a pond bobs up and down three times per second on ripples with wavelength 10.5 cm. A fish resting at the surface of the pond is 8.50 m from the water bug. How long does it take a ripple passing the water bug to reach the fish?
a. 27.0 s b. 243 s c. 81.0 s d. 0.893 s