![]() Sound waves travel along the string to the bottom part of the can which One person speaks into the can or cap while another person presses the In a big knot or tied to a matchstick inside the can or cup. Pass cotton or fishing line or string through the holes with the end tied Punch a small hole in the bottom of each can or cup. Drag a wet paper towel along the string.Ĭut the lids out of two used tin cans or use two plastic cups. Repeat the experiment by drawing the fingers along the string at differentĢ. Hold the can with one hand and keep the string tight with the fingers. Knot or tied to a match stick inside the can. Pass a string or fishing line through the hole with its end tied in a big Punch a small hole in the bottom of a metal beverage can. ![]() Hold a tuning fork loosely by the handle and strike the prongs againstĪgain, strike the prongs and quickly touch water in a pan with the tipsġ. Press the thumb and forefinger against the larynx and make a low-pitchedĥ. Put a drum on a desk and scatter puffed cereal grains or pieces ofĤ. Hold a ruler on the edge of a desk with 15 cm extending over the edgeģ. Stretch and pluck rubber bands and the strings of string instruments.Ģ. See diagram 4.97.1: Stretched rubber band.ġ. Note the markings on the tuning forks, e.g. Repeat this experiment by moving the glass at different speeds and using The table fast enough to make a wavy line on it. Start the tuning fork vibrations with the finger and move the glass along Lay the smoked glass under the prong with the fine wire bent to touch Hold the fork rigidly by the handle and horizontally just above the table Use hot wax to attach a piece of fine wire to the prong of a tuning fork. See diagram 4.94: Wave patterns of a tuning fork A Fine wire, B Wax, C Smoked glass sheet on table, D Tuning fork not vibrating, These three vibrations can combine to form a pattern. The last ripples usually have an even higher frequency than the other Wind will make tiny ripples across the surface of the motorboat waves. The boat sends out its own waves, which have a higher frequency than ocean Let a small motorboat pass over these waves. The way in which different sound frequencies combine is analogous to water The number of complete vibrations in one second is the frequency of a particular A Pure note, B Different frequencies combined A Ocean wave, B Boat wave, C Ripples, D Combination waveĢ. See: Resonance Kundt's tube, (Commercial).Ģ6.3.1.9 Sonometer, monochord, Mersenne's lawĢ6.3.1.1 Paper rider method, fundamental of stringĢ6.3.1.10 Pitch and mass (density) of vibrating stringsĢ6.3.1.11 Plastic bottle guitar, stringed instrumentĢ6.3.1.2 String resonates with tuning forkĢ6.3.1.4 String vibrates at constant lengthĢ6.3.1.3 String vibrates at constant tensionĢ6.3.1.4.1 Violin strings and piano stringsĢ6.0.0 Sound, sound waves, reflection, refraction, diffractionĢ6.3.3.4 Comb resonator, amplify sound from comb, chimesĢ6.3.3.5 Drink-can to amplify the sound of a threadĢ6.3.3.9 Knocking on bottles, blowing over bottlesĢ6.4.93 Sea wave patterns and sound wave patternsĢ6.4.95 Seeing and feeling vibrations which make sound wavesĢ6.4.100 Sound cannot travel through a vacuumĢ6.6.8 Forced vibration from tuning forksĢ6.6.4 Frequency of a tuning forks with a sonometerĢ6.6.13 Tests for materials that absorb sound with tuning forksĢ6.6.1 Sound wave patterns of tuning forks, waveform of tuning forksĢ6.6.5 Speed of sound in air and frequency of tuning forksĢ6.3.1.2 String resonates with tuning forksĢ6.1.0 Wave properties of sound, oscillation, vibrationĢ6.1.2 Oscillation of object and production of soundĢ6.1.1 Sound wave patterns, oscillations, origin of sound, tuning fork vibrationĢ6.1.13 Vibrating desk, blackboard, chalkboardĢ6.1.9 Vibrating drums and balloons, ping-pong ball and tuning forkĢ6.1.6 Vibrating tuning fork touching waterĢ6.3.3.10 Vibrations in wind harps, Aeolian harp Sound, Pitch, Frequency, Resonance, Tuning forks.Ģ6.3.2 Resonance in air columns, musical instrumentsĢ6.3.1 Resonance in strings, musical instrumentsĢ6.2.7 Stretched rubber band, change in pitchĢ6.2.6 Thin and thick strings, change in pitchĢ6.3.2.14 Blow over open and closed drinking strawĢ6.3.2.15 Bunsen burner and trombone resonanceĢ6.3.2.12 Drinking straw oboe and tromboneĢ6.3.2.5 Resonance in paper pipe or drinking straw
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