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Which letter represents wavelength: A. Which letter represents the wave crest: C. Which letter represents the wave trough: D. Which letter represents amplitude: B. What is measured from crest to crest or trough to trough: Wavelength. You shine a light on a mirror and the light waves bounce back. Which phenomenon is happening: reflection. A wave is a disturbance that transfers ________ from one place to another. : Energy. What types of waves can travel through empty space AND mediums: Electromagnetic. Which 2 types of waves require a medium to travel: Sound. Which of the following is a mechanical wave: Sound. What medium do sound waves travel fastest through: Solids. What is the correct formula for wave speed: . Which wave has the largest wavelength: B. Which wave has the largest frequency: C. What type of wave is pictured: Longitudinal wave. Unit used to measure the frequency of wavelengths: Hertz. What does A represent: Compression. What does B represent: Rarefaction