Iron is a poor choice of nuclear fuel because it releases
A) energy only when fused.
B) energy only when fissioned.
C) no energy when fused or fissioned.
When a skateboarder pushes on a wall,
A) an interaction occurs between the skateboarder and the wall.
B) the wall pushes on the skateboarder.
C) such a push couldn’t happen unless the wall pushed on the skateboarder.
D) all the above
E) none of the above
Diffuse reflection occurs when the size of surface irregularities is
A) small compared to the wavelength of the light used.
B) large compared to the wavelength of the light used.
C) microscopic.