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Sci- Ch 21
| Question | Answer |
|---|---|
| What are all sounds generated by | vibrations |
| Sounds travel as what type of waves | Longitudinal waves |
| What unit is used to express how loud or soft a sound is perceived | Decibel (dB) |
| Which part of the ear increases the size of the vibrations of sound waves entering the ear | Middle ear |
| At the same temperature, in which medium does sound travel fastest; gas or solid or liquid | Solid |
| What type of interference occurs when the compressions of one wave overlap the compressions of another wave; Destruction or Constructive | Constructive interference |
| How quickly a sound reaches your ears depends on what | The medium through which the sound is traveling |
| What do sound waves require for them to be able to travel | A medium |
| Sound can travel in a vacuum- True of False | False; they can not travel in a vacuum |
| Your ears convert sound into ________ impulses that are sent to your brain | Electrical impulses |
| If a meteorite crashed on the moon, would you be able to hear it on Earth; Why, or why not | No; There is no medium between the moon and Earth to carry the sound |
| As a medium cools, the speed of sound generally (pick one)- decreases or increases | Decreases |
| When particles start to slow down, they transmit energy more (pick one)- slowly or quickly | Slowly |
| How do the frequency and pitch of the sound seem to a person IN FRONT of a moving car with its horn honking- low or high | High |
| What term means the measure of how high or how low a sound is perceived to be | pitch |
| Pitch is NOT related to how far away the source of the sound is from your ear- True of False | True |
| What type of sound is produced by a dog whistle | ultrasonic sound |
| The apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound is called what | The Doppler effect |
| How do the frequency and pitch of the sound seem to a person BEHIND a moving car with its horn honking- low or high | Low |
| What does using earplugs and lowering the volume of sounds help prevent | Hearing damage |
| What happens to the pitch of the sound that the driver hears when his horn is honking | The driver always hears the same pitch |
| What is loudness | How loud or soft a sound is perceived |
| What do you call the maximum distance the particles in a wave vibrate from their rest positions | Amplitude |
| In relation to sound, what do the medium and the temperature effect | The speed of the sound |
| The pitch of a sound becomes higher as the frequency of the sound wave becomes- (pick one) lower or higher | Higher |
| Frequency is expressed in what units | Hertz (Hz) |
| Loudness decreases with the amplitude of the sound- True or False | False, it increases |
| Loudness is expressed in what | Decibels (dB) |
| When you pluck a string on a musical instrument, what type of wave forms | Standing wave |
| Resonance is when a vibrating object causes a nearby object to vibrate- True or False | True |
| The amplitude and frequency of a sound can be measured electronically by what instrument | Oscilloscope |
| Pitch is a measure of how high or low a sound is perceived to be, depending on the frequency of the | Sound wave |
| The Doppler effect is an observed change in the frequency of a wave when the source or observer is- (pick one) standing still or moving | Moving |
| In general, how does the temperature of a medium affect the speed of sound through that medium | Sound tends to travel fastest in higher-temperature media |
| What property of waves affects the pitch of a sound | The frequency of sound waves |
| Will a listener notice the Doppler effect if both the listener and the source of the sound are traveling toward each other | Yes; The sound waves in front of the source will become closer together as the source moves forward |
| What are reflected sound waves called | Echoes |
| Sound barriers and shock waves are created by what | Interference |
| What type of waves form at an object’s resonant frequencies | Standing waves |
| What vocab words refers to when a vibrating object causes a second object to vibrate at one of its resonant frequencies | Resonance |
| What is the explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person’s ears | Sonic boom |
| What type of interference occurs when the compressions of one wave overlap the rarefactions of another wave | Destructive interference |
| Resonance happens when two objects naturally vibrate at the same ______ | Frequency |
| The blending of pitches through interference produces an instrument’s what | sound quality |
| Sounds with frequencies higher than 20,000 Hz are called | ultrasonic sounds |
| The frequency of a sound wave determines the _________ of the sound | the pitch |
| Air particles travel with sound waves- True or False | False |
| An echo is most likely to result when sound hits a surface that is either (pick one)- rough and soft or smooth and hard | Smooth and hard |
| What medical condition can result from long-term exposure to loud sounds | Tinnitus |
| What type of interference results in an increased amplitude, and it produces a louder sound | Constructive |
| The extent to which a note can be heard determines its (pick one)- loudness or pitch | Loudness |
| How low or high the note sounds is its (pick one)- loudness or pitch | Pitch |
| The hammer, anvil, and stirrup bones are in what part of the ear; outer or middle or inner | Middle ear |
| What type of interference decreases the amplitude, and produces a softer sound; Constructive or Destructive | Destructive |
| Vibrations are changed into electrical signals in what part of the ear | The inner ear |
| What part of the ear that collects sound waves | The outer ear |
| In a ________ wave, some portions of the wave are at rest while other portions have a large amplitude | Standing wave |
| What is the outer part of the ear called that collects sound waves and directs them into the ear canal | Pinna |
| In the inner, vibrations are changed into ________ signals to be interpreted by the brain | Electrical Signals |
| What part of the ear has bones that act as levers to increase the size of vibrations | Middle ear |
| In resonance, the sound produced by one object causes the other object to do what | Vibrate |
| What is the process of using reflected sound waves to find objects; used by animals such as bats | Echolocation |
| What is a longitudinal wave that is caused by vibrations and that travels through a material medium | Sound wave |
Created by:
youngcrews