When a beam of nuclear radiation of initial intensity I0 passes through a thickness x of material, the intensity of the beam exiting the material is I =
a. I0e??x.
b. I0e?x.
c. I0(e??x ? 1).
d. I0(e?x ? 1).
e. I0(1 ? e??x).
a
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Free Fall: Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
A. increases. B. decreases. C. stays constant. D. increases at first, but then stays constant. E. decreases at first, but then stays constant.
Cosmic inflation continues today in the cosmological redshifts and dark energy
Indicate whether the statement is true or false
An electron gun sends electrons through a region with an electric field of 
for a distance of 2.5 cm. If the electrons start from rest, how fast are they moving after traversing the gun?
a. 
b. 
c. 
d. 
e. 
Stellar parallax provides concrete proof that the
A) Earth rotates on its axis B) Earth is roughly spherical C) Earth moves around the Sun D) Moon moves around the Earth