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sound 17
| Question | Answer |
|---|---|
| How does sound relate to energy? | Sound waves transport energy from one place to another. |
| What is the relationship between frequency and pitch? | Pitch is the human perception of sound frequency. |
| What is the average range of a young person's hearing? | 20 to 20,000 hertz |
| Distinguish between infrasonic and ultrasonic sound waves. | Infrasonic is too low in frequency (below 20 Hz) for humans to hear, whereas ultrasonic is too high (above 20,000 Hz). |
| Relative to solids and liquids, how does air rank as a conductor of sound? | Relative to solids and liquids, air is a poor conductor of sound. |
| Why won't sound travel in a vacuum? | There is no material in a vacuum to vibrate and carry the sound. |
| Distinguish between a compression and a rarefaction. | In a compression, the molecules are closer together than average; in a rarefaction, they are further apart. |
| Do compressions and rarefactions travel in the same direction, or in opposite directions, in a wave. | They travel in the same direction at the same speed. |
| What factors does the speed of sound depend upon? What are some factors that it does not depend upon? | It depends on temperature and humidity, not on loudness and frequency |
| What is the speed of sound in dry air at 20°C? | 340 m/s |
| Does sound travel faster in warm air or in cold air? In humid air or dry air? | Faster in warm air, faster in humid air |
| Which is normally greater, the energy in ordinary sound or the energy in ordinary light? How does the speed of sound compare to the speed of light? | The energy in ordinary light is greater than the energy in ordinary sound. The speed of sound is a million times less than the speed of light. |
| What ultimately happens to the energy of sound in the air? | It becomes thermal energy. |
| The pitch of sound is most closely related to _________. | frequency |
| What is an echo? | Reflection of sound is an echo. |
| What is a reverberation? | A sound that persists after many reflections |
| Sound travels from one place to another mainly in a series of _________. | compressions and rarefactions |
| What is the difference in the speed of sound on a warm day versus on a cold day? | It is faster on a warm day and slower on a cold day. |
| How does the direction of sound travel compare to the shapes of the sound waves? | The sound is at right angles to the waves. |
| How does the cooler air above the lake affect the movement of sound at night? | Because it is colder just above the surface and warmer higher above, the sound wave is refracted toward the ground. |
| How do the waves of sound travel on the night that produces the temperature inversion, and why? | The waves bend toward the ground because it is warmer above and colder lower below, and waves travel more slowly through the colder air. |
| What is the cause of refraction? | Different speeds of sound in a medium |
| Does sound tend to bend upward or downward when its speed is less near the ground? | Downward |
| Why does sound sometimes refract under water? | Changing temperature changes the speed of sound in water. |
| What is ultrasound? | Sound above the frequency of human hearing |
| Why will a struck tuning fork sound louder when it is held against a table? | The table is forced to vibrate, and its large surface vibrates more air than the tuning fork. |
| Which two factors determine the natural frequency of an object? | Elasticity and shape |
| The speed of sound in air varies with _________. | air temperature |
| How do forced vibrations relate to resonance? | When forced vibrations match an object's natural frequency, resonant amplification occurs. |
| When you listen to a radio, why do you hear only one station at a time rather than all stations at once? | The natural frequency of the electronics is tuned to resonate with the frequency of one station. |
| How did wind-generated resonance affect the Tacoma Narrows Bridge in the state of Washington in 1940? | The resonant amplification of bridge motion destroyed the bridge. |
| A reverberation occurs when sound undergoes _________. | multiple echoes |
| Refraction of sound occurs with changes in wave _________. | speed |
| What physical phenomenon underlies the production of beats? | interference |
| What beat frequency will occur when a 370-Hz and a 374-Hz sound source are sounded together? | 4 Hz |
| How does a radio wave differ from a sound wave? | A radio wave is an electromagnetic wave that travels at the speed of light, whereas a sound wave travels at the speed of sound through air or another elastic medium. |
| Forced vibrations mainly occur in _________. | sounding boards |
| The natural frequency of a small bell is _________. | higher than for a larger bell |
| Resonance occurs when forced vibration _________. | matches natural frequency |
| Interference is a property of _________. | sound, light, and water waves |
| The phenomenon of beats is most closely related to _________. | interference |
Created by:
rufus webster