vibrations and sound Word Scramble
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| Question | Answer |
| sound | a mechanical wave that is produced by vibrating objects |
| accoustics | the study of sound |
| fundamental frequency | the frequency at which a body tends to vibrate if it is free to do so |
| harmonics | frequencies that are multiples of the fundamental frequency. f is first harmonic, 2f is second harmonic etc |
| overtones | frequencies which are multiples of the fundamental frequency. 2f is the first harmonic, 3f is the second harmonic |
| resonance | the response of a body to vibrations of its own natural frequency. resonance occurs when a body is forced to vibrate at its own natural frequency, resulting in large amplitude oscillations and maximum energy transfer between forcing agent and object |
| frequency limits of audibility | 20Hz to 20000Hz |
| the human ear | is most sensitive to frequencies between 2kHz and 4kHz |
| threshold of hearing | the smallest intensity audible by the average human ear at a frequency of 1kHz |
| sound intensity | the energy per second passing through unit area perpendicular to the direction to which the sound is travelling |
| sound intensity level | gives the intensity of sound relative to the threshold of hearing. if the sound intensity doubles, the sound intensity level decreases by 3dB. |
| music | sound of a regular frequency, consisting of related frequencies such as fundamental and harmonics, with a periodic waveform |
| noise | sound with a constantly varying frequency and with no repetition or pattern in the waveform |
| demo: to show that sound needs a medium to travel | set up apparatus as shown with the bell jar ringing. air is removed from the bell jar using a vacuum pump. As air is removed, the loudness of the sound decreases until nothing is heard. conclusion: sound needs a medium to travel |
| factors which determine the natural frequency |
Created by:
erina27
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