SAT Subject Physics Practice Question 174: Answer and Explanation
20. A simple harmonic oscillator has a frequency of 2.5 Hz and an amplitude of 0.05 m. What is the period of the oscillations?
A. 0.4 sec
B. 0.2 sec
C. 8 sec
D. 20 sec
E. 50 sec
Correct Answer: A
The period is the reciprocal of the frequency: T = 1/f = 1/(2.5 Hz) = 0.4 sec.