What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
A)
reflection
B)
refraction
C)
polarization
D)
dispersion
E)
interference
E
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Calculate the net radiant-heat-transfer rate if the two surfaces in Problem 11.18 are black and are connected by a refractory surface with an area of 500 m2. A1 is at 555 K and A2 is at 278 K. What is the refractory surface temperature?
GIVEN
• Rectangular surfaces A1 and A2 connected by a refractory surface A3
• A1 is parallel to and centered 5 m above A2
• Dimensions of A1 = 1 m × 20 m
• A2 is 20 m2
• A3 is 500 m2
• Temperature of A1 (T1) = 555 K
• Temperature of A2 (T2) = 278 K
• A1 and A2 are black
FIND
(a) The net radiating heat transfer rate (q1)
(b) The refractory surface temperature (T3)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Young's Modulus: A brass wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. By what distance did this fixture stretch the wire? Young's modulus for brass is 10 × 1010 N/m2.
A. 0.11 mm B. 0.22 mm C. 0.33 mm D. 0.62 mm
Measuring the changing light output of a star to search for exoplanets is called ________.
A. spectroscopy B. the Doppler method C. the transit method D. gravitational lensing
When the electric field vibrations of a light
wave are restricted to one direction, the wave has been a) dispersed. b) diffused. c) diffracted. d) polarized.