Physics frequency of tuning fork3/16/2024 The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. The entire system (string, guitar, and enclosed air) begins vibrating and forces surrounding air particles into vibrational motion. The sound box in turn forces air particles inside the box into vibrational motion at the same natural frequency as the string. On the other hand, if the string is attached to the sound box of the guitar, the vibrating string is capable of forcing the sound box into vibrating at that same natural frequency. If you were to take a guitar string and stretch it to a given length and a given tightness and have a friend pluck it, you would hear a noise but the noise would not even be close in comparison to the loudness produced by an acoustic guitar. This input of energy disturbs the particles and forces the object into vibrational motion - at its natural frequency. Whatever the case, a person or thing puts energy into the instrument by direct contact with it. For instance, a guitar string is strummed or plucked a piano string is hit with a hammer when a pedal is played and the tines of a tuning fork are hit with a rubber mallet. These two values to get the time between echoes.Musical instruments and other objects are set into vibration at their natural frequency when a person hits, strikes, strums, plucks or somehow disturbs the object. Place the cursor over the first peak you see, and record the time that Times when the microphone picks up an echo. The “peaks” that you see on the graph are the Graph on the screen will show the sound picked up by the microphone. The “collect” button, and have someone clap their hands loudly at the end of First, measure the length of the tube.īy the sound as it bounces back and forth in the tube? To catch the initial sound we make, and any echoes that come back. We place a microphone at one end of the tube, The sound will “bounce” back and forth, echoing inside the tube. We use this basic equation:Įscaping from the tube because the sound wave has a wavelength longer than the Know how far a sound travels, and how long it takes to travel. We can calculate the speed of sound if we Instruments produce “pure tones” like tuning forks? Use your data to defend your answer. Times, with different voices or instruments. Determine the frequency (or frequencies) of that tone. Your voice or a musical instrument (both, if possible) to make a musical note These two tones are separated by an octave.įrequencies of sounds separated by an octave? That two of the forks are marked with the “C” note. You found, how well does the computer measure frequency? Create a data table with the following columns: Note, Inscribed Frequency, Measured The frequency of each fork using the computer. Calculate the percentage difference between the frequency inscribed on It will show up in red on the lower graph asĭetermine what the frequency of that peak is. You hold the ringing tuning fork up to the microphone, and hit “collect,” theĬomputer will determine the frequency of the sound. That the musical note should be inscribed on the fork, along with the supposedįrequency – the number of vibrations per second for the sound. Do Not strike it against a hard surface! Hold the fork up to your ear and listen to Take one of the tuning forks and strike it with the rubber clapper. Which is the technical term for its pitch. We shall use an echoing resonance tube to measure the speed of sound.Ĭan also use the computer and microphone to tell us the frequency of a sound, In this experiment we shall investigate variousĪ computer and microphone to determine the frequencies of various sounds.
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