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The equation for the period of a simple pendulum starting at a small angle (a) is: T = 2pi*SQRT(L/g). or. T = 2Ïâ(L/g). where. 1  T is the period in seconds (s). 2  pi = 3.14 (it is also written as the Greek letter Ï).quations for period and frequency. The period of the motion for a pendulum is how long it takes to swing back-and-forth, measured in seconds. Period is designated as T. The frequency of a pendulum is how many back-and-forth swings there are in a second, measured in hertz. Frequency is usually designated as f.
Best Answer: The period, T, is the time required for one complete cycle and the unit is seconds. The equation for period is: T=1/frequency The frequency is the number of complete cycles in one second and the unit is Hz or S^-1 So T= 1/25.0Hz, T= 0.04 seconds.Source(s): Jenn26 Â· 7 years ago.Thumbs up.ind the following values for this wave: a) Period (Hint: frequency is given) b) Speed I know... show more Waves and Vibrations unit in High School Physics course... -Homework question: A wave with an amplitude of 9 cm and a wavelength of 20 cm is traveling in the positive x direction with a frequency of 25.0 Hz.