From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
A) gamma rays, x-rays, ultraviolet, visible light, infrared, radio
B) infrared, visible light, ultraviolet, x-rays, gamma rays, radio
C) radio, infrared, visible light, ultraviolet, x-rays, gamma rays
D) gamma rays, x-rays, visible light, ultraviolet, infrared, radio
A) gamma rays, x-rays, ultraviolet, visible light, infrared, radio
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Evidence that supports quasars being the nuclei of very distant galaxies includes
a. the existence of quasar fuzz. b. the observation of a supernova near a quasar whose distance from its brightness is consistent with the large redshift. c. gravitational lensing of some quasars by nearby galaxies. d. all of the above e. none of the above
A multi-tube heat exchanger is used in a process plant to pre-heat air before it enters a combustion chamber, using low pressure steam that flows inside the tubes and condenses. The tube bundle is configured with 6-cm outer diameter tubes in a staggered arrangement as shown in the accompanying figure. The condensing steam in the tubes maintains their outer surface temperature at 117°C, and air at 60° flows across the tube bank with a free stream velocity of 1.0 m/s. Determine the average heat transfer coefficient for air.
GIVEN
• Air flow through the tube bank shown
• 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 ) ASSUMPTIONS
• Steady state
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.0279 W/(m
K) Kinematic viscosity (?) = 19.4 × 10–6 m2/s
Prandtl number (Pr) = 0.71 At Tw: Prs = 0.71
Suppose that inflation did not occur. In that case, the fact that the cosmic microwave background has the same temperature in opposite directions of the sky would be considered
A) surprising, because those locations would never have been close enough to have any light or matter exchanged between them. B) surprising, because we would not expect those locations to have the same age. C) natural, because everything in the universe is naturally expected to have the same temperature. D) natural, because quantum fluctuations in the early universe would have ensured that the whole universe had precisely the same temperature.
The most famous G type star is:
A) Polaris. B) Betelguese. C) Sirius. D) the Sun. E) Pollux.