Cracking the SAT Physics Subject Test, 2013-2014 Edition (College Test Preparation) by Review Princeton

Author:Review, Princeton [Review, Princeton]
Language: eng
Format: epub
ISBN: 9780307945754
Publisher: Random House Information Group
Published: 2013-04-30T00:00:00+00:00

Point of View #2: t Varies, x Does Not

Now we will designate one position x along the rope to watch as time varies. One way to do this is to visualize two screens in front of the rope, with only a narrow gap between them. We can then observe how a single point on the rope varies as a wave travels behind the screen (the wave is traveling because we aren’t freezing time here). This point on the rope moves up and down. Since the direction in which the rope oscillates (vertically) is perpendicular to the direction in which the wave propagates (or travels, horizontally), this wave is transverse. The time it takes for one complete vertical oscillation of a point on the rope is called the period, T, of the wave, and the number of cycles it completes in one second is called its frequency, f. The period and frequency are established by the source of the wave and T = 1/f.

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