Flashcards
Science 8L
Cards in this deck (36)
- 1how are sounds made?by something moving backwards and forwards creating vibrations
- 2what are vibrations?the motion of backwards and forwards
- 3how do we speak?our vocal chords in our throats vibrate
- 4what do vibrations create?sound waves
- 5what is the can and string experiment?the experiment to see that sound can travelle through string and so doesn't need air
- 6what is the bell in jar experiment? and what does it show?when you take out air of a ringing bell to show that sound is still there but cant travel without a substance using a devise
- 7what does sound travel as?a wave
sound wave - 8What does a sound wave do?transfers energy from a sourse to our ears
- 9How is sound transmitted?vibrating particles in the air
- 10where is sound produced?a vibrating source
- 11need to know thissound waves transverse energy the particles (say in the air) don't move
- 12how do transverse travel(direction)?90 degress
perpindicular to the direfction the energy is being transversed - 13what else are transverse waves?electromagnetic spectrum eg:
light
radio waves
xrays... - 14what direction do longitudinal waves travel?same direction that energy is being transversed
parrallel - 15how do we hear sound?sound waves reach the ear drum. When the compression (collected particles in the wave) hit the hear drum the ear drum moves inward. when the rarefaction (loose particles) hit the ear drum the ear drum moves out wards. this creates the ear drum to vibrate.
- 16what is intensity?the loudness of softness of sound
- 17what is the through and the peak in a sound wave?through-end of a sound wave at the bottom
peak-the top of a sound wave above the line - 18what is the amplitude and the wave length?wave length-distance between each wave
alpitude-distance of peak to the halfway line - 19what do all the pitches look like? loud low pitch loud high pitch quiet low pitch quiet high pitch...
- 20What is a oscilloscope?how people work out a soundwave
how musical instruments can get represented - 21what is the brick-eco method?clap 10 times and measure how long each evo takes to get back and calculate the average to the the speed of sound
- 22what is the microphone method?put a sound wave through 2 microphones inlined and measure how long it takes the sound to get to the first microphone to the next by using a special devise
- 23how do you calculate speed?speed = distance / time
- 24what are 3 differences between light and sound?light is faster ( 340 m/s 300,000 km/s)
different waves
light can travelle through a vacumm - 25describe the process of sound traveling through the ear.Sound travelles through the pinna to the canal to the 3 ossicles: hammer, anvil and stirrup into the conchlea to the messages (then to the brain)
- 26What is noise?an unwanted sound
- 27what is dBdecibles the mesurment of sound
- 28What are the 2 ways to reduce sound?cover the sound sorce in sound proofing material
cover own ears in sound proofing material - 29what is reflection?the sound wave bouncing off in the same angle
- 30what is absorbtion?sound getting taken in only some bounces off
- 31what is dispersing?when the sound wave bounces off in many directions and ammounts
- 32what is an eco?the reflection of a sound wave
- 33what is ultrasound?sound wave which is too high for humans to hear
- 34what are some uses of ultrasound waves?cleaning jewlery
scanning unborn babies
animal communicaion
treating kidney stones - 35What can cause ear damage?wax that blocks the ear
loud bang
infection
age - 36what is a sound intensity meter?a devise for measuring sound
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- 8Summer Exam (Science) Flashcards on Science 8L, created by HRYN red on 19/02/2018.
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- HRYN red · Feb 2018
- Updated
- Feb 19, 2018
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