Pendulum:

the period is always defined as T, the time to make one complete oscillation (the back and forth motion)

for a pendulum, T = 2p(g/L)^(1/2)

where L = length of the pendulum, g = 9.8 m/s²

Notice it's independent of the mass!!!!

This is pretty straightforward.

Wave motion

l = wavelength (in meters)

f = frequency (Hz)

v = velocity (m/s)

with that we have

v = lf

relating velocity, wavelength and frequency.

also note that f = 1/T, where T = the period, or the time to complete one cycle. (the frequency is how many cycles fit into one second)