A physical barrier to listening might include
a. thinking about what to have for lunch
b. lack of focus
c. being biased against the speaker
d. loud music
Answer : d. loud music
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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
An ideal gas is held in a container of volume V at pressure P. The rms speed of a gas molecule under these conditions is v. If now the volume and pressure are changed to 2V and 2P, the rms speed of a molecule will be
A) 1/2 v B) v C) 2v D) 4v E) v/4
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
a. 0.0227 s. b. 0.377 s. c. 2.26 s. d. 105 s. e. 1750 s.
In a Young's experiment, the paths from the slits to a point on the screen differ in length, causing destructive interference at the point. Which of the following path differences would cause this destructive interference?
a. 3l/2 c. 5l b. 4l d. None of these choices.