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19. A wave has a wavelength of 0.75 m and a speed of 6.94 m/s. What is the wave frequency? 20. A wave has a

19. A wave has a wavelength of 0.75 m and a speed of 6.94 m/s. What is the wave frequency? 20. A wave has a frequency of 10 Hz and a wavelength of 4.3 meters. What is the wave speed? 21. A pencil appears bent as it sits in a beaker full of water. What property of waves does this represent

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