A ruby’s red color results from the substitution of _____________atoms for aluminum atoms in a crystal of Al2O3.
Fill in the blank(s) with the appropriate word(s).
chromium
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The air in an automobile engine at 20°C is compressed from an initial pressure of 1.0 atm and a volume of 200 cm3 to a volume of 20 cm3 . Find the temperature if the air behaves like an ideal gas (g = 1.4) and the compression is adiabatic
a. 730°C b. 460°C c. 25°C d. 50°C e. 20°C
The picture below shows a sphere as it looks at rest. Suppose the sphere is moving to the right at about 90 percent of the speed of light. Which figure below correctly shows the shape of the sphere as you would measure it?
A) Figure A B) Figure B C) Figure C D) Figure D E) Figure E
According to the shell model, which electrons play the most significant role in determining the properties of an atom?
A) those in the innermost shell B) those in the shells between the innermost and outermost shells C) those in the outermost shell D) Electrons in every shell are just about equally important.
Thermal Expansion: The coefficient of linear expansion of aluminum is 24.0 × 10-6 K-1, and the density of aluminum at 0°C is 2.70 × 103 kg/m3. What is the density of aluminum at 300°C?
A. 3.93 × 103 kg/m3 B. 2.73 × 103 kg/m3 C. 2.70 × 103 kg/m3 D. 2.67 × 103 kg/m3 E. 2.64 × 103 kg/m3