From the point of view of a muon produced high in the atmosphere, the reason it can get to the ground before it decays is because
a. relativity gives it extra time to get there.
b. of the uncertainty principle.
c. it is a short distance to the ground.
d. relativity shortens the distance to the ground.
d
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What is the density of a mixture of 90% air 
and 10% helium (density of 0.180 
a. 
b. 
c. 
d. 
e. 
When a current flows through a metal wire, the moving charges are
A) only electrons. B) negative metal ions. C) only protons. D) positive metal ions. E) both protons and electrons.
How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 0.44 J B) 0.44 mJ C) 0.44 nJ D) 0.44 ?J
In a Compton scattering experiment, the scattered photon has a wavelength of 6.55 pm. If the scattering angle is 
what is the wavelength of the incident photon?
A. 5.68 pm B. 7.42 pm C. 3.28 pm D. 0.868 pm E. 2.43 pm