Hydrogen has absorption lines at 656 nm and 486 nm. Where are the emission lines from hydrogen in this part of the electromagnetic spectrum?
A. 656 nm and 486 nm
B. 826 nm and 656 nm
C. 571 nm and 401 nm
D. 486 nm and 316 nm
Answer: A
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Two ideal gases, X and Y, are thoroughly mixed and at thermal equilibrium in a single container. The molecular mass of X is 4 times that of Y. What is the ratio of root-mean-square velocities of the two gases, vX, rms /vY, rms?
a. 4/1 b. 2/1 c. 1/2 d. 1/4 e. 1/3
A cyclic process is carried out on an ideal gas such that it returns to its initial state at the end of a cycle. If the process was carried out on a clockwise sense around the enclosed area, as shown on the p-V diagram in Fig
12-2, then that area represents A) the heat added to the ideal gas. B) the heat that flows from the ideal gas. C) the work done by the ideal gas. D) the work done on the ideal gas.
The temperature coefficient of resistivity is a quantity that is:
a. always positive. b. always non-negative. c. sometimes negative. d. represented by the symbol ?.
A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h