# Thread: Wave length of a Pendulum

1. ## Wave length of a Pendulum

Hi, I have the following problem.

Pendulum A is 20 cm long and has a 5g mass on it. Pendulum B is 30 cm long and has 10g mass on it. Which one has a faster period?
First of all, does the mass of the pendulum matter at all? and if not then I I would need to find the time in both cases and divide by 1 right? Using the equation d=v1t+0.5at^2

Time Pendulum A= 0.20 s which means that the period is 0.20 s.
Time Pendulum B= 0.25 s which means that the period is 0.25 s.

Am I right? Thank you in advance.

2. ## Re: Wave length of a Pendulum

Originally Posted by sakonpure6
Hi, I have the following problem.

First of all, does the mass of the pendulum matter at all? and if not then I I would need to find the time in both cases and divide by 1 right? Using the equation d=v1t+0.5at^2

Time Pendulum A= 0.20 s which means that the period is 0.20 s.
Time Pendulum B= 0.25 s which means that the period is 0.25 s.

Am I right? Thank you in advance.
The distance formula you used can be used to derive the following:
$T = \frac{1}{2 \pi} \sqrt{L/g}$
where L is the length of the pendulum.

-Dan