Which change will not change the kinetic energy of the most energetic electrons emitted in the photoelectric effect?
a. changing the brightness of the light
b. changing the frequency of the light
c. changing the metal the light is hitting
d. All of the above will change the electron's kinetic energy.
a
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Reconsider the heat exchanger of Problem 6.38 with an inline tube arrangement, where the centerlines of the tubes are spaced 7.5 cm apart, both in the longitudinal and transverse directions. Compare the results with those for the staggered tube arrangement and comment upon the difference. Also, which of the two arrangements is expected to have a larger pressure drop?
GIVEN
• Air flow through a tube bank
• Tube spacing (S) = 7.5 cm = 0.075 m
• Air temperature (Ta) = 60°C
• Air velocity (Us) = 1 m/s
• Tube outside diameter (D) = 6 cm = 0.06 m
• Tube wall temperature (Tw) = 117°C FIND
• The average heat transfer coefficient ( ch )
• Steady state
SKETCH
If the universe has a density greater than ?o = 1, it is considered high density
Indicate whether the statement is true or false
You are in an airplane, traveling relative to the ground at 500 km/hr. You throw a baseball toward the front of the plane at a speed of 50 km/hr. How fast would someone on the ground say the baseball is moving?
A) 550 km/hr B) 50 km/hr C) 500 km/hr D) 450 km/hr.
The electric field at the surface of a positively charged conductor has a direction characterized by which of the following?
a. tangent to the surface b. perpendicular inward toward the charge c. at a 45° angle to the surface d. perpendicular outward and away from the charge