Which of the following describes what will happen to a light ray incident on an air-to-glass boundary?
a. total transmission
b. partial reflection, partial transmission
c. partial reflection, total transmission
d. total reflection
B
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A steel bracket ABC (EI 5 4.2 106 N?m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum horizontal displacement of joint C is approximately:
(A) 22 mm
(B) 31 mm
(C) 38 mm
(D) 40 mm
A refrigerator has a coefficient of performance of 4 . If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
a. 40.5 b. 37.5 c. 36.5 d. 34.5 e. 22.5
In Young's double-slit experiment, light was first passed through a narrow single slit before going on to the double-slits. The reason for the first slit was
A. to ensure a constant phase relationship between the interfering light waves. B. to polarize the light. C. to screen out all wavelengths except those in the visible light spectrum. D. to reduce the brightness of the light so the interference pattern could be seen.
What slit separation would a grating have to produce a first-order maximum at an angle of 
for a wavelength of 589 nm?
A. 109 nm B. 690 nm C. 378 nm D. 458 nm E. 916 nm