Sound w - Georgetown High School



Sound wavesInvestigation 16A: Sound wavesSound waves are traveling oscillations of air pressure. This interactive simulation allows you to determine the amplitude, wavelength, and frequency of some typical musical notes by matching the waveform in both time and space. Part 1: Matching the parameters of a sound wave21323306667500Choose a note and adjust your speakers so you can hear it. Set the time and amplitude values until you can see at least a few cycles of the sound wave.While time t is plotted on the horizontal axis, see if you can make the black wave match the red sound wave by adjusting the frequency and amplitude. Switch to distance for the horizontal axis. Match your black wave to the red sound wave by adjusting the wavelength and amplitude. A good match has a score of greater than 95%. You must match both frequency and wavelength in order to score 100%.QuestionsWhat is the frequency and wavelength of the note “C” on the left-hand side of the keyboard?Describe how the observed wave varies with loudness.Determine the frequency and wavelength for at least 4 different sounds. Table 1: Frequency and wavelength notefrequency wavelength From your data, discuss possible relationships between frequency and wavelength with your lab partners. Propose and test an equation that expresses your hypothetical relationship.Sound wavesInvestigation 16A: Sound wavesSound waves are traveling oscillations of air pressure. This interactive simulation allows you to determine the amplitude, wavelength, and frequency of some typical musical notes by matching the waveform in both time and space. Part 1: Matching the parameters of a sound wave21323306667500Choose a note and adjust your speakers so you can hear it. Set the time and amplitude values until you can see at least a few cycles of the sound wave.While time t is plotted on the horizontal axis, see if you can make the black wave match the red sound wave by adjusting the frequency and amplitude. Switch to distance for the horizontal axis. Match your black wave to the red sound wave by adjusting the wavelength and amplitude. A good match has a score of greater than 95%. You must match both frequency and wavelength in order to score 100%.QuestionsWhat is the frequency and wavelength of the note “C” on the left-hand side of the keyboard?Describe how the observed wave varies with loudness.Determine the frequency and wavelength for at least 4 different sounds. Table 1: Frequency and wavelength notefrequency wavelength From your data, discuss possible relationships between frequency and wavelength with your lab partners. Propose and test an equation that expresses your hypothetical relationship.Part 2: Going further with octavesDevise and conduct an experiment to determine what happens to the frequency and wavelength of sound when you set the octave to different values. Note that the octave can only be set to positive integers. Describe your experiment and display your data in the space below. Table 2: Octavesnotefrequency wavelength QuestionsWhat do you conclude is caused by setting different octaves?How does this fit with your prior knowledge of music?Part 2: Going further with octavesDevise and conduct an experiment to determine what happens to the frequency and wavelength of sound when you set the octave to different values. Note that the octave can only be set to positive integers. Describe your experiment and display your data in the space below. Table 2: Octavesnotefrequency wavelength QuestionsWhat do you conclude is caused by setting different octaves?How does this fit with your prior knowledge of music? ................
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