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Properties of Waves Challenge Jadyn is watching a transverse wave traveling through a medium and counts a total of 42 crests and troughs in 140 seconds. She makes a good estimate of the wavelength to be 80.0 cm and the amplitude to be 25.0 cm. 1. Determine Frequency Frequency = 2. Determine Period Period = 3. Determine Velocity Velocity = 4. The wave's amplitude changes to 1.0 m. Determine the Energy is relative change in Energy. (i.e. the energy is _ _ times greater or times lesser.)