Ask the student to push his index finger against his ear (as though he’s plugging his ear).How could the student hear the sound more loudly (without hitting the tuning fork harder)?.Ask the student what it feels and sounds like. Strike the tuning fork and firmly place the handle of it on the cartilage at the end of the student’s nose.Strike the tuning fork with a rubber mallet or with the rubber sole of a shoe. Can the students see or hear the vibrations? Probably not.Refer to the movement of air particles in the activity Sound = Vibration, Vibration, Vibration) to form your theory. In which medium does sound travel the fastest: gas, liquid, or solid?ĭraw the molecules in a gas, liquid, and solid.īrainstorm with a partner to hypothesize which medium will cause the sound waves to travel fastest. What did the tuning fork’s vibration go through in order to reach the person’s ear?Ĭan sound travel through liquids as well as solids? If this is a 128 Hz tuning fork, how fast will the student’s nose vibrate if we touch it with the fork?ĭo you think that vibrations can pass through materials (media) other than air? Part 1:If this is a 128 Hz tuning fork, how many vibrations per second does it make?.If using this as an activity, provide the materials above for each pair of students. Rubber mallet or the rubber bottom of a shoe Sound doesn't only pass through air, it can also pass through solids!ĭescribe what pitch is and how it varies. The molecules in the student's bones vibrate. In this demo, the student's arm acts as a resonator to direct path of the vibration to the ear, amplifying the sound of the fork. The object amplifies (increases) the sound of the fork. A resonator (a type of a hollow rectangular box) is often used. The handle motion is small, which means you can hold the fork by the handle without damping the vibration, but it's strong enough that the handle can transmit the vibration to another object. One reason for using a fork shape is that the handle vibrates up and down as the prongs move apart and together. Its main use is as a standard of pitch to tune other musical instruments. The pitch that a particular tuning fork generates depends on the length of the two prongs. It reaches a specific constant pitch when you set it vibrating by striking it against a surface or with an object. A tuning fork is a two-pronged fork with the prongs (tines) formed from a U-shaped bar of metal (usually steel).
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