Monday, November 29, 2010

Grading period

You should have turned in

1. Definitions 5 point possible

2. blues song 10 points possible

3.took the online test on sound waves. 10 points possible

Tuesday, November 16, 2010

mail to plhsbooth.blogspot.com

Wednesday ... Last day for full credit on blues song

sound wave study guide

sound waves study guide


Sound and Acoustics Study Guide
(Student formed questions)


1. Describe a wave.
A: A disturbance that travels through a medium, transporting energy from one location to another location.

2. What are the two categories of waves?
A: Mechanical and electrical.

3. What does a wave, which is created by vibrating objects and propagated through a medium from one location to another create?
A: Sound.

4. What does a medium do?
A: It carries the disturbance from one location to another.

5. What is the typical medium in sound waves?
A: Air.

6. How is the sound wave is transported from one location to another?
A: By means of particle-to-particle interaction.

7. True of false, the original source of a wave is some vibrating object capable of disturbing the first particle of the medium?
A: True.

8. Is sound a mechanical wave or electrical wave?
A: Mechanical.

9. For a sound wave traveling through air, the vibrations of the particles are best described as ___________ ?
A: Longitudinal.

10. The distance which a disturbance travels along the medium in one complete wave cycle is called what?
A: Wavelength.


1. Q. How can a wave be described?
A. As a disturbance that travels through a medium, transporting energy from one location to another location
2. Q. What is a medium?
A. The material through which the disturbence is moving
3. Q. What are longitudinal waves?
A. The waves that the motion of the individual particles of the medium is in a direction which is parallel to the direction of energy transport
4. Q. When the wave length is far apart it is know as?
A. Low pitched frequency
5. Q. When the wave length is close together it is known as?
A. High pitched frequency

6. Q. What is a mechanical wave?
A. The sound that results from the back and forth vibration of the particles of the medium from the sound wave that is moving
7. Q. What is a pressure wave?
A. When the repeating pattern of high pressure and low pressure regions moving through a medianin a sound waves

8. Q. What are compressions?
A. Regions of high air pressure within the longitudinal motion of air particles

9. Q. What are rarefractions?
A. Regions of low air pressure within the longitudinal motion of air particles

10. Q. What is the equilibrium of a wave?
A. The resting postition of a wave.

The study of sound, ultrasound and infrasound is called?
-Acoustics

7 Q. What does the inner ear do?

A. It turns pressure waves into vibrations so that your auditory nerve can read it.


8 Q. What is the difference between speed and frequency of sound?

A. Frequency is how often and speed is how fast


9 . Q. If you were to stretch an elastic string attached to a wall and pluck it what would the returning force be called?

A. The force would be called a reflected pulse


10 . Q. What is the formula for sound'sintensity?

A. Intensity=Power/Area



What do they mark frequency with
A:A Hertz which is-
1 Hertz = 1 vibration/second

What is a natural frequencie?
The frequency or frequencies at which an object tends to vibrate with when hit, struck, plucked, strummed or somehow disturbed is known as A:The
natural frequency of the object.
7. What is fundamental frequency?
A:The lowest frequency produced by any particular instrument. Also known as the harmonic.

Q. What is a pressure wave?
A. When the repeating pattern of high pressure and low pressure regions moving through a medianin a sound waves
8. Q. What are compressions?
A. Regions of high air pressure within the longitudinal motion of air particles
9. Q. What are rarefractions?
A. Regions of low air pressure within the longitudinal motion of air particles


Answer fallowing questions listed below. Answers are given after the fallowing questions.

1.) The sound produced by a bell cannot be heard since sound cannot travel through …………..

A. Car

B. Vacuum

C. Jar

2.) Longitudinal are waves in which the motion of the individual particles of the medium is in a direction which is parallel……

A. The direction of energy transport.

B. The direction of energy through light

C. The direction of a computer

3.) Since a sound wave consists of a repeating pattern of high pressure and low pressure regions moving through a medium, it is sometimes referred to as a……

A. Wavelength

B. Pressure

C. Pressure wave

4.) Frequency refers to how often the air particles….

A. Move

B. Jump

C. Vibrate

5.) The human ear can detect such a sound. YYYEEEEAAA! This faintest sound which a human ear can detect is known as the…….

A. Scale

B. Threshold of hearing

C. I was born with hearing dummy

6.) The faster a sound wave travels, the more distance it will cover in the same period of…..

A. Heat

B. Air

C. Time

7.) The three tiny bones of the middle ear act as levers to amplify the

A. Vibrations to the ear bone

B. Vibrations to the ear flap

C. Vibrations of the sound wave

8.) Music is a mixture of sound waves which typically have…….

A. whole number ratios between the frequencies

B. two whole number ratios between frequencies

C. seven whole number ratios between frequencies

9.) If a moving source of sound moves at the same speed as sound, then the source will always be at the…..

A. leading edge of the waves which it produces.

B. at the right depicts snapshots in time of a variety of wavefronts produced

C. none

10.) The disturbance which returns to the left is known as the……

A. Boundary

B. Reflected pulse

C. sound waves

answeres are highlighted

5. What is a Mechanical Wave?

A. A wave that requires a medium to transport it.




  • How is sound created and detected?

Sound is a vibration or wave of air molecules caused by the motion of an object

  • Is sound a waveform in matter?

Yes

  • Does sound travel in a vacuum?

No

  • What is the speed of sound?

Speed of sound at sea level = 340.29 meters/second


  • What is a wavelength?

The wavelength of a sinusoidal wave is the spatial period of the wave – the distance over which the wave's shape repeats

What is sound?

Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations


  • What are the frequencies for infrasound?

Infrasound is sound that is lower in frequency than 20 cycles per second

  • What are the audio frequencies and wavelengths?

Infrasound consists of very low frequency sound, beyond the range of hearing of humans. Infrasound wavelengths can reach many kilometers

  • What is ultrasound and how is it used?

Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing. In medicine, ultrasound is used to detect changes in appearance of organs, tissues, and vessels or detect abnormal masses, such as tumors.





Monday, November 8, 2010

12 bar blues.

We need to move PC users onto macs. If you have finished your 12 bar blues, free up a mac so I can get the rest of the class on the assignment.
Todays Assignment