Chapter 13 - Vibrations and Waves - Learning Path Questions and Exercises - Exercises - Page 485: 21

a) 1.7s b) 0.57s

a) The formula for 2$\pi$$\sqrt{L/G}$. When the length of 0.75 is plugged in for L and 9.8 is plugged in for g, the result is 1.7 seconds. b) For this part, since the period is already known, from the previous part, the formula for frequency is 1/Period. So, the frequency is 0.57 seconds.