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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.

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14y ago
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Q: What is the period of the wave having amplitude 1.25cm and wavelength 2cm?
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