Discrete radii and energy states of atoms were first explained by electrons circling the atom in an integral number of
A) wave frequencies.
B) de Broglie wavelengths.
C) diffraction patterns.
D) high-speed particles.
E) none of the above
Answer: B
You might also like to view...
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
A. 3.5 rad/s B. 3.8 rad/s C. 4.1 rad/s D. 2.0 rad/s E. 5.6 rad/s
2.20 kilograms of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes. What is its change in entropy? (For water, Lv = 2.26 × 10^6 J/kg)
a. 2.67E+4 J/K b. 1.33E+4 J/K c. 6.66E+3 J/K d. 4.44E+3 J/K e. 1.82E+4 J/K
When a material is found to have a definite volume but no definite shape, and when it assumes the shape of the container in which it is placed, what is the phase of the material?
a. Gas b. Liquid c. Plasma d. Solid
The efficiency of a heat engine is defined as the ratio of
A) the heat input at the high temperature to the heat output at the low temperature. B) the heat output at the low temperature to the heat input at the high temperature. C) the work it does to the heat input at the high temperature. D) the work it does to the heat output at the low temperature. E) the work it does to the difference between the heat input from the heat output.