QOTD. 1: What is a Transverse wave? A longitudinal wave? 2: Which one needs a medium?. ANSWERS TO QOTD… 11/30/2009. 1:TRANSVERSE: vibrates perpendicular to the direction in which the wave travels LONGITUDINAL: vibrates parallel to the direction in which the wave travels 2: BOTH
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1: What is a Transverse wave? A longitudinal wave?
2: Which one needs a medium?
Chapter 12 Notes
Transverse wave, matter vibrates up and down (perpendicular) to the direction in which the wave travels. A transverse wave can carry energy without using matter.
Compressional (longitudinal or sound) wave particles are displaced back and forth parallel to the direction of the wave; it requires a medium to travel.
hand drawn way
At a constant speed, if frequency increasesthewavelength decreases, or
when frequencydecreases the wavelength increases. V = F
Click here to go to interactive website on frequency and wavelength
The speed of sound can be used to estimate distances. Sound travels at 343 m/s at standard temperature and pressure.
Sound travels best in SOLIDS.Sounds can NOT travel at all in space (or in any vacuum)
Medium Temp (oC) Velocity (m/s)
1. Sound travels in a compressional wave.
2. A higher frequency means a higher pitch.
3. Sound travels fastest through solids
4. Soundcannot travel without a medium.
5. Soundcannot travel in space, or any
Intensity depends on the strength of the compressions. (VOLUME = intensity)
Squeak = High Pitch = High Frequency = small wavelength.
Growl= low pitch= low frequency =Large Wavelength
The range of human hearing is between 20 Hz and 20,000 Hz. Most humans cannot hear frequencies outside this range.
Echo - a sound wave that reflects
off a surface. If you direct a loud
sound at a hard surface, the sound will
bounce back to you.
Reduce echos by using soft
surfaces. (curtains, carpet, padded
walls and seats)
Echolocation is a way that sound is used to measure distances using echoes.Applications of echolocation include: submarine, ultrasound or sonagrams, and radar. Echolocation is used by dolphins, insects, bats and birds.
C. How far is a dolphin from his pod if the speed of his sonar signal travels at 1482 m/s and it takes 20s for the sound to go from him, to the pod and back?
C.How far is a dolphin from his podif the speed of his sonar signal travels at 1482 m/s and it takes 20 s for the sound to gofrom him, to the podand back?
Resonance is the tendency of an object to vibrate at the same frequency as another vibrating source.Ex. Speakers in a car can get so loud, the car dash vibrates too. Ex. Hit a tuning fork and rest it on a table.
Rest it on a test tube in a rack.
--Instruments use resonance to amyplify sound.
(ex-guitar…pluck a string and it as well as the body will vibrate)
Waves enter the outer ear, and travel through the ear canal until they strike the eardrum
Vibrating air causes the eardrum to vibrate
These vibrations enter the middle ear, containing the 3 smallest bones in the body
The small bones transfer the vibration to the side of the cochlea
The fluid in the spiral of the cochlea vibrates and creates waves that travel up the spiral
Nerves at different locations along the spiral will respond todifferent frequencies
The nerve cells convert the vibrations in the liquid to electric impulses and send them to the brain
The brain interprets the impulses as a sound
Sound Navigation and Ranging.
d = vt
surgery and unborn fetuses.
1-2 and 4-6
Complete all ch 12 vocab!