sound 17
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| How does sound relate to energy? | Sound waves transport energy from one place to another.
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| What is the relationship between frequency and pitch? | Pitch is the human perception of sound frequency.
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| What is the average range of a young person's hearing? | 20 to 20,000 hertz
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| 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).
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| 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.
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| Why won't sound travel in a vacuum? | There is no material in a vacuum to vibrate and carry the sound.
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| Distinguish between a compression and a rarefaction. | In a compression, the molecules are closer together than average; in a rarefaction, they are further apart.
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| 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.
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| 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
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| What is the speed of sound in dry air at 20°C? | 340 m/s
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| 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
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| 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.
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| What ultimately happens to the energy of sound in the air? | It becomes thermal energy.
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| The pitch of sound is most closely related to _________. | frequency
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| What is an echo? | Reflection of sound is an echo.
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| What is a reverberation? | A sound that persists after many reflections
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| Sound travels from one place to another mainly in a series of _________. | compressions and rarefactions
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| 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.
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| How does the direction of sound travel compare to the shapes of the sound waves? | The sound is at right angles to the waves.
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| 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.
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| 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.
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| What is the cause of refraction? | Different speeds of sound in a medium
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| Does sound tend to bend upward or downward when its speed is less near the ground? | Downward
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| Why does sound sometimes refract under water? | Changing temperature changes the speed of sound in water.
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| What is ultrasound? | Sound above the frequency of human hearing
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| 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.
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| Which two factors determine the natural frequency of an object? | Elasticity and shape
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| The speed of sound in air varies with _________. | air temperature
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| How do forced vibrations relate to resonance? | When forced vibrations match an object's natural frequency, resonant amplification occurs.
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| 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.
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| 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.
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| A reverberation occurs when sound undergoes _________. | multiple echoes
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| Refraction of sound occurs with changes in wave _________. | speed
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| What physical phenomenon underlies the production of beats? | interference
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| What beat frequency will occur when a 370-Hz and a 374-Hz sound source are sounded together? | 4 Hz
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| 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.
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| Forced vibrations mainly occur in _________. | sounding boards
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| The natural frequency of a small bell is _________. | higher than for a larger bell
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| Resonance occurs when forced vibration _________. | matches natural frequency
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| Interference is a property of _________. | sound, light, and water waves
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| The phenomenon of beats is most closely related to _________. | interference
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Created by:
rufus webster