Pre-Lab: Resonance and Speed of Sound In the lab you will measure the speed of sound in air using…

Pre-Lab: Resonance and Speed of Sound In the lab you will measure the speed of sound in air using two tuning forks with frequencies (f equal to 384HZ and 512 Hz respectively. Hz or Hertz is a unit of frequency in cycles per second. At room temperature of about 20C the speed of sound in air is approximately 342.9 m/s. Speed is always measured as distance divided by time, but for waves we can use special distances and times. The distance a wave travels in one cycle is a wavelength, and we use the symbol 2. for this special distance. The time it takes for a wave to travel one wavelength is the

View complete question »Pre-Lab: Resonance and Speed of Sound In the lab you will measure the speed of sound in air using two tuning forks with frequencies (f equal to 384HZ and 512 Hz respectively. Hz or Hertz is a unit of frequency in cycles per second. At room temperature of about 20C the speed of sound in air is approximately 342.9 m/s. Speed is always measured as distance divided by time, but for waves we can use special distances and times. The distance a wave travels in one cycle is a wavelength, and we use the symbol 2. for this special distance. The time it takes for a wave to travel one wavelength is the time period “T” which is also related to the frequency “f, f-1/T. For wave speed we simply have: If we know the frequency (on our tuning forks) and measure the wavelength, 2 of a given sound, then we can determine the speed of sound in air. We measure the wavelength of sound by listening for resonance (a loud sound) as we hold the tuning fork over the end of a plastic pipe partially filled with water. The two resonant conditions found by moving the water are a half wavelength apart. The wave conditions on our picture show approximately one fourth of a wavelegth filling the tube at one resonance, and approximately three fourths of a wavelength at another resonance. Using the theoretical speed of sound in air given above, determine the expected wavelength for each of the tuning forks you will use in lab 384 m S12 m Now that you have predicted wavelengths you can predict for each of the two experiments (each tuning fork) where the two resonant conditions will occur (see figure below). This will be useful to know prior to lab. Keep a copy of the predictions so that you have these to work with in lab. Note that in the figure the first resonance occurs approximately 1/4h wavelength from the top of the tube. The next resonance occurs an additional half wavelength further down, or a total of approximately 3/4th wavelength down the tube 384 Hz Tuning fork First Resonance Position Predicted m Second Resonance Position Predicted m 512 Hz Tuning fork First Resonance Position Predicted _m Second

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