The amplitude has nothing to do with the period of the wave, but you do have to know its speed.
Period = (wavelength) / (speed)
If you're talking about sound, then the speed is 343 meters per second.
Period = (0.02) / (343) = 5.831 x 10-5 seconds = 0.00005831 second.
If you're talking about electromagnetic waves, then the speed is 300,000,000 meters per second.
Period = (0.02) / (300,000,000) = 6.67 x 10-11 second = 0.0000000000667 second.
1" =2.5cm so 125cm = 50" inches which is 4'2"
1250 mm
125cm
49.21
125cm tall
It is precisely 4.10 feet.
125cm
125cm = 4 feet 1.2 inches.
just over 4 feet
3 ft 2 in
125cm (100cm per meter).
(1.25m)(100cm/m) 125cm