Determine the molar analysis of standard air (79% N2, 20% O2, and 1% argon, by volume) with 100 ppm of radon gas at 101 kPa, 20ºC.
What will be an ideal response?
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The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra
a. True b. False Indicate whether the statement is true or false
Jupiter is a ball of gas
a. True b. False Indicate whether the statement is true or false
Energy Conservation With Conservative Forces: When you throw a pebble straight up with initial speed V, it reaches a maximum height H with no air resistance. At what speed should you throw it up vertically so it will go twice as high?
A. 16V
B. 8V
C. 4V
D. 2V
E. 
V
Which statement about spiral galaxies is FALSE?
A) most of their star formation occurs in the spiral arms B) their disks rotate at more than 100 kilometers per second C) a type "c" spiral has tight, smooth arms D) a type "a" spiral has a large bulge compared to a type "c" spiral E) a merger of two spiral galaxies may give rise to an elliptical galaxy