When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A) 363 nm B) 752 nm C) 633 nm D) 336 nm
C
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A parallel plate capacitor has plates each of area 100 cm2 and with separation 0.25 mm. What is its capacitance?
A. 40 nC
B. 0.35 nC
C. 4.4 
F
D. 88 pdf
E. 88 F
During the time that a planet is in its period of apparent retrograde motion
A) The planet moves backwards (clockwise as viewed from above Earth's north pole) in its orbit of the Sun. B) The planet appears to rise in the west and set in the east, rather than the usual rising in the east and setting in the west. C) Over many days or weeks, the planet moves westward relative to the stars, rather than the usual eastward relative to the stars. D) The planet is getting closer to the Sun in its orbit.
One U.S. fluid gallon contains a volume of 231 cubic inches. How many liters of gasoline would you have to buy in Canada to fill a 14-gallon tank? (Note: 1 L = 103 cm3.)
A. 53 B. 21 C. 14 D. 8.0 E. 4.0
"Perfect mirrors" are made by
a. coating a glass surface with an extremely pure layer of silver or aluminum. b. coating a glass surface with an extremely pure layer of silver or aluminum and then coating the metal surface with a quarter-wavelength thickness of the dielectric magnesium fluoride. c. stacking thin layers of different dielectric materials on a glass surface. d. heating an ordinary mirror almost to its melting point.