Potential: How much kinetic energy does a proton gain if it is accelerated, with no friction, through a potential difference of 1.00 V? The proton is 1836 times heavier than an electron, and e = 1.60 × 10-19 C.
A. 1836 eV
B. 1.00 eV
C. 1.60 × 10-19 eV
D. 1.00 J
E. 1836 J
Answer: B
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Two parallel plates of infinite extent perpendicular to the page are situated relative to each other as shown in the figure. The upper plate is at 300°C and the lower plate is at 100°C. Determine the net rate of radiation heat transfer from the upper and lower plate assuming the environment is at a temperature below 100°C. Assume that both the lower surface of the upper plate and the upper surface of the lower plate are black.
GIVEN
• Two parallel plates of infinite extent perpendicular to the page.
• Upper plate temperature (T2) = 3000C
• Lower plate temperature (T1)= 1000C
• Length of the plates L1 = L2 = 2 m
• Distance between the plates (R) = 1 m
FIND
(a) Net rate of radiation heat transfer from upper and lower plate.
ASSUMPTIONS
• Lower surface of upper plate and upper surface of lower plate are black.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
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