7th grade: Sound Research

1. Define "sound", using your textbook or your own mind! A disturbance that travels through a medium as a longitudinal wave.
2. As you know, there are 3 major types of waves. Draw a Venn Diagram to compare and contrastthe 2 main types of waves.

   Longitudinal Waves	Longitudinal Waves and Transverse Waves	Transverse Waves
   Particle displacement is parallel is parallel to the direction of wave propagation, the particles move left and right.	Both waves particles do not actually move with the wave.	The particle displacement is perpendicular to the direction of the wave propagation particles move up and down

   
   
   3. Predict which statement is true: a) As frequency increases, pitch stays the same. b) As frequency increases, pitch stays the same. c) As frequency increases, pitch decreases.
   7. Observe the structure of the ear if the person nearest to you, without disturbing them. Carefully sketch what you see below:
   
   8. Describe how the form, or shape, of the outer ear relates to its function, or job. I think that the reason the ear it shaped the way it does because it seems to be acoustically fit to pick out sounds.
   9. Predict what will happen when sound waves pass through the auditory canal and encounter the eardrum. Be sure to justify your prediction: When the sound wave passes through the ear and encounters the eardrum it will make the eardrum vibrate.
   10. How does my your prediction from question 9 compare with what you see? I think that my prediction was basically right because the sound waves encounter the eardrum the the sound will sort of make it bounce back and forth and then the sound passes through so that you can hear it.
   11. Fill in the table below:

   Destination after eardrum	Name of structure	Outcome
   1st	Ossicles, or tiny bones, including the malleus, incus, and stapes. (Hammer, anvil, and stirrup.)	They move back and forth.
   2nd	Passes vibrations into your inner ear.	They set off wave-like motions in the fluid inside your snail-shaped cochlea.
   3rd	This stimulates sensory hair cells in your cochlea.	This generates a nerve impulse which travels along your cochlear nerve to your brain.