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Audiology
CSDI 4100
| Question | Answer |
|---|---|
| What 3 things does sound require? | 1. Source of Energy 2. Sound Source(vibrating object/brief event) 3. Elastic Medium |
| What is the rapid and random movement of air particles? | Brownian Movement |
| Condensation/Compression vs. Rarefaction? (Air Molecules) | Compression: When the molecules are close together Rarefaction: There is space between the molecules. |
| Compression/Condensation vs. Rarefaction? (Sine Wave) | Compression: Hills/Peaks Rarefaction: Troughs/Dips |
| What is a Transverse Wave? Give Example. | Motion of the molecules is perpendicular to the wave propagation. (Ex. Pebble in water, basilar membrane movement, stadium wave) |
| What is a Longitudinal Wave? Give Examples. | Molecules move in the same way as the wave propagation when force is applied. (Ex. Wheat in the wind, a sound wave) |
| What is a Sine Wave? | A graphic representation of a sound wave. |
| What is Frequency? What is it perceived as? | # of cycles per second; perceived as pitch. |
| What is Period in sound? How could you find this? | Time required to complete a full cycle of vibration; 1/Frequency |
| As the length of a wave increases, frequency _____. | Decreases |
| What is Wavelength? | The distance from any point on a sine wave (0 to 360 degrees) to the same point on the next cycle of the wave (Peak to Peak OR Valley to Valley) |
| Do lower or higher frequency sounds have an easier time moving around obstructions? | lower |
| What is Phase? | Position of an object in its cycle of vibration, described in relation to degrees in a circle |
| What does it mean if two waves are "In-Phase"? | If 2 wave forms have the same frequency and at same phase |
| What does it mean if two waves are "Out-of-Phase"? | If 2 waveforms have the same frequency, but not the same phase |
| What is Amplitude? What is it perceived as? | Maximum distance reached in either direction on a Sine wave. Perceived as loudness or intensity. |
| What is Free Vibration? | An object stops its vibration naturally without an external force coming to continue the vibration |
| What is Forced Vibration? | Applied Force causes a vibrating object to continue vibrating |
| Sound velocity is determined by what 3 factors? | Elasticity of the medium, force, friction |
| What is a Beat? | The perceived increase or decrease in amplitude/sound intensity that occurs when two near-identical tones are presented |
| Simple vs. Complex Sounds? | Simple sounds have only one tone, complex sounds have multiple. |
| What is a decibel? | It is a ratio, a comparison between what is being measured and a reference. |
| Does 0 dB indicate silence? What does ti indicate? | No. I just indicates that there is no difference between what is being measured and the reference. |
| For dB IL, when the intensity of the wave is doubled, what happens? | the dB is not doubled, it is increased by 3 dB |
| For dB SPL, when sound pressure level is doubled, what happens to the dB? | It is not doubled. It is increased by 6 dB |
| What does zero hearing level mean (0 dB HL)? | The lowest intensity that simulated normal hearing |
| What is dB Sensation Level? (dB SL) | The number of dB above a person's threshold. |
| What is a pure-tone threshold? | the level at which the tone is so soft a person can only detect the tone 50% of the time it is presented |
Created by:
saniahrodgers