Monochromatic light from a He-Ne laser (? = 632.8 nm) is incident on a diffraction grating containing 5000 lines/cm. Determine the angle of the first-order maximum.
A. 18.4°
B. 39.2°
C. 14.6°
D. 27.7°
E. 13.9°
Answer: A
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Silver contains 
conduction electrons per m3. How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?
a. 
b. 
c. 
d. 
e. 
A ___________________ binary is shown in the above simulated spectra
a. single-lined spectroscopic
b. double-lined spectroscopic
c. visual
d. eclipsing
A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle
(a) How much work is done on the gas in each cycle? (b) How much heat is exhausted into the hot reservoir in each cycle?
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 230 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.84 s, 206 m/s b. 8.39 s, 119 m/s c. 6.85 s, 150 m/s d. 9.69 s, 103 m/s e. 3.43 s, 292 m/s