100 g of liquid nitrogen at its boiling point of 77 K is stirred into a beaker containing 600 g of 15°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? The heat of vaporization of nitrogen is 48 cal/g and that of water is 80 cal/g
a. none
c. 68 g
b. 29 g
d. 109 g
A
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The ____________________ planets have larger radii than the ____________________ planets
Fill in the blank(s) with correct word
The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B?
a. 2 to 1
b. 1 to 2
c. 2 to 3
d. 3 to 2
e. 1 to 3
Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength l = 0.093 4 nm are used, what is the smallest angle q at which a diffraction maximum may be obtained?
a. 9.92° b. 7.60° c. 13.3° d. 15.5° e. 6.52°
How is chromatic aberration corrected in large astronomical reflecting telescopes?
A. a combination of lenses designed to cancel the aberrations B. use a parabolic mirror instead of a spherical mirror C. a properly constructed telescope has no aberration D. change the resolution of the telescope