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Sceince 8th Grade
8th Study Guide for Sound
| Question | Answer |
|---|---|
| What kind of waves are Sound Waves? | Longitudinal Waves |
| What is a material that tends to absorb rather than transmit sound waves? | Foam Rubber |
| The speed of sound waves through ocean water is 1437 m/s. Assume that ultrasound waves take 2 seconds to travel from a sonar device on a ship to the bottom of the water and back to the ship again. How deep is the water? | 1437 m |
| Compared to a higher- pitched sound, a lower pitched sound always has a ........ | lower frequency |
| The frequency of sound waves is measured in...... | meters/second |
| The speed of sound through air is fastest when the air temperature is ...... | 60 C |
| _________ occurs when an object vibrates in response to sound waves of a certain frequency. | Resonance |
| The intensity of sound depends on what? | Amplitude of the sound waves produced by the sound source Distance the sound waves have traveled from the sound source |
| Intensity is a measure of sound wave's .... | energy |
| Functions of the ear include : | Gathering sound waves Amplifying sound waves Changing sound waves to electrical signals. |
| This is not an example of a part of the outer ear | oval window |
| The inner ear includes: | Sirrup Cochlea Anvil |
| The most common cause of hearing loss is...... | loud sounds |
| Sound waves generally travel most quickly through? | Solids |
| Explain why sound waves travel more quickly through solids. | Particles are very close together so easy for the particles to touch and pass on the energy of the wave. |
| True or False: The use of reflected ultrasound waves to create images of organs inside the body is called ultrasonography. | True |
| True or False: All sound waves begin with vibrating matter. | True |
| True or False: Sound waves from a police car siren move away from the car in all directions. | True |
| True or False: Sound waves that are closer together have a lower frequency. | False |
| True or False: Sound waves can travel only through matter. | True |
| True or False: Hearing loss caused by loud sounds is temporary. | False |
| True or False: An 80 decibel sound is 20 times louder than a 60 decibel sound. | False |
| The distance that sound waves travel in a given amount of time is the ________ of sound. | Speed |
| The speed of sound is _________ m/s in dry, 20 degree C air. | 434 |
| ______ refers to how the listener perceives the intensity of sound. | Loudness |
| The unit used for measuring the intensity of sound is the ___. | decibel |
| How high or low a sound seems to a listener is its _________. | pitch |
| The ______ of sound waves is the number of waves that pass a fixed point in a given amount of time. | frequenccy |
| Any sound with a frequency that is too high for humans to hear is called ________. | ultrasound |
| Any sound with a frequency that is too low for humans to hear is called _____. | infrasound |
| The organ that humans use to sense sound energy is. | ear |
| The organ that interprets the sounds we sense is the ____. | Brain |
| The fact that sound waves cannot travel through empty space was first demonstrated in the 1600's by _________. | Robert Boyle |
| Explain the ticking clock in a sealed jar demonstration. | He placed a ticking clock in a sealed jar, the clock could still be heard. Vacuumed out the air and then the clock could not be heard. The sound could not be heard because there was nothing for sound to travel through. |
| The normal human hearing range is from ______ Hz to ______ Hz. | 20 - 20,000 |
| Explain how bats use ultrasound. | They send out ultrasound waves and use their echos to identify the locations of objects they cant see. |
| A police car is speeding north with its siren blaring. Explain the Doppler effect using the terms frequency and pitch as the police car is approaching you and then moving away from you. | As the car approaches the sound waves in front of the car get closer together, increasing their frequency, which then has a higher pitch. After the car passes the sound waves get farther apart, decreasing their frequency, which then decreases the pitch |
| Explain how the siren would sound if you were riding in the police car with the siren blaring. | The siren would sound the same all the time because it will remain the same distance from me. |
| Compare and Contrast earplugs and electronic hearing protectors. | Both will protect my hearing Earplugs will muffle sounds by partially blocking all sound waves from entering the ear. Electronic hearing protectors identify high amplitude sound waves and send destructive interference sound waves through them. |
| What are the three categories of musical instruments? Include and example of each. | Percussion- Drums, Xylophone Wind- Clarinet, Flute Stringed- Violin, Guitar and Piano. |
Created by:
cromine