In an x-ray diffraction experiment, using x-rays of wavelength ? = 0.434 × 10^?10 m, a first-order maximum occurred at 8° off the crystal plane. Find the distance d between crystal planes
a. 1.56E–10 m
b. 2.19E–11 m
c. 4.88E–10 m
d. 1.70E–9 m
e. 3.12E–10 m
a
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A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the heat that is withdrawn from some lower temperature?
A. 90 J B. 75 J C. 50 J D. 25 J
Consider a compass with a square magnet placed in a uniform electric field, as shown below. Supposing that we place the square-magnet compass in a rightward magnetic field 
instead of a rightward electric field 
.
A. Clockwise, to align itself with the field. B. Counter clockwise, to align itself with the field. C. 180° either clockwise or counter clockwise. D. It won’t turn, as it is already aligned with the field. E. It won’t turn, because the field wants to twist it around a different axis altogether. F. It won’t turn because it is not affected by this field.
Which of the following may be determined using Ampere's law?
a) electric fields due to current carrying wires b) magnetic forces between two current carrying wires c) magnetic fields due to current carrying wires d) magnetic forces acting on charged particles e) magnetic fields due to permanent magnets
If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would cool off and continue to shrink as its density increased. B) The density of the core would decrease, causing the core to cool off and expand. C) The core would heat up, causing it to radiate so much energy that it would shrink even more. D) The core would heat up, fusion rates would increase, and the core would re-expand.