A thin film appears magenta when illuminated with white light. The color being cancelled by destructive interference is
A) red.
B) green.
C) white.
D) blue.
E) none of the above
Answer: B
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In the construction of a space platform, two structural members of equal size with surfaces that are considered black are placed relative to each other as shown schematically below. Assuming that the left member attached to the platform is at 500 K, the other is at 400 K and that the surroundings are treated as though black at 0 K, calculate (a) the rate at which the warmer surface must be heated to maintain its temperature, (b) the rate of heat loss from the cooler surface to the surroundings, (c) the net rate of heat loss to the surroundings for both members.
GIVEN
• Two black surfaces as shown above on a space platform
FIND
(a) The rate of heating of the warmer surface (q1)
(b) Net rate of heat loss to the surroundings (qs)
(c) The rate of heat loss from the cooler surface to the surroundings (q2s)
ASSUMPTIONS
• Steady state
• The surroundings behave as a blackbody enclosure at Ts = 0 K
• The plate also lose heat from their back surface
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
The cosmic microwave background radiation was released shortly after the formation of the first stars
a. True b. False Indicate whether the statement is true or false
How are frequency and period related in simple harmonic motion?:
a) They are directly related b) They are inversely related c) Their sum is constant d) Both measure the number of cycles per unit of time
The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is
A) less than 30°C. B) at or about 30°C. C) more than 30°C.