A silicon monoxide thin film (n = 1.45) of thickness 77.6 nm is applied to a camera lens made of glass (n = 1.55). This will result in a destructive interference for reflected light of what wavelength?
a. 720 nm
c. 450 nm
b. 558 nm
d. 522 nm
C
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Single-phase alpha titanium alloys _________be welded.
Fill in the blank(s) with the appropriate word(s).
A person weighs 155 pounds. What is the person's weight in Newtons?
A. 155 N B. 689 N C. 39.3 N D. 392 N
If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough, and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.
A solar heated house loses about 7.4 × 10^7 cal through its outer surfaces on a typical 24-hour winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62°C by the solar collectors, and the house is maintained at 20°C? (Specific heat of rock is 0.21 cal/g • °C.)
a. 160 kg c. 6100 kg b. 1200 kg d. 8400 kg