Determine the absorptivity of radiation through a 5 foot wide plume of exhaust gases at 180ºF and 1 atmosphere pressure. The gases are a mixture of air with relative humidity of 15% and carbon dioxide having mole fraction of 20%.

What will be an ideal response?


Assume the gases are non-reflecting so that

Physics & Space Science

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Where is the center of the Universe?

A.) The center of the Universe is near a particular distant galaxy, and the Big Bang originated only at that point. B.) The Andromeda Galaxy is at the center of the Universe. Everything expanded from there. C.) There is no center to the Universe. Expansion is happening everywhere. D.) The Milky Way Galaxy is at the center of the Universe. Everything expanded from there. E.) No one knows where the center of the Universe is.

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It is impossible to tell the difference between the two types of supernovae

Indicate whether the statement is true or false

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From the mass-luminosity relation, a 2 solar mass star on the main sequence would have a luminosity of approximately ____ solar luminosities

a. 2 b. 4 c. 11 d. 0.5 e. 0.25

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An important reason for using a very large diameter objective in an astronomical telescope in space is

A) to increase the magnification. B) to increase the resolution. C) to increase the width of the field of view. D) to form a virtual image, which is easier to look at. E) to increase the depth of the field of view.

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