what effect did changing the angle have on the period of oscillations? a. when the angle was less than 15 degrees, changing the angle had no effect on the period. when the angle was much larger, the period was longer. b. as the angle increased, the period decreased. c. when the angle was less than 15 degrees, changing the angle had no effect on the period. when the angle was much larger, the period was shorter. d. the angle has no effect. e. as the angle increased, the period increased.