Sound

How does changing the length of the sound wave affect the sound produced? Use diagrams to help you answer this. Define amplitute. How does changing the amplitude of the sound affect the sound produced? Give an example and use diagrams to help you answer this

What is sound proofing? What materials can be used to sound proof a room? What kind of rooms should be sound proofed? What is ULTRASOUND and NOISE CANCELLING HEADPHONES? How do they work?

Inner Ear How do we hear sound and how the ear drum works? When something makes a noise, it sends vibrations, or sound waves, through the air.Then it goes to the ear. The eardrums are like an omnidirectional microphone. The sound pressure moves the membrane (diaphragm) from one side.  What is the speed of a sound? Sound travels through air at 340 meter(1,120 feet) per second.  What is the doppler effect? A change in the observed frequency of a wave, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart. The motion of the source causes a real shift in frequency of the wave, while the motion of the observer produces only an apparent shift in frequency.

**wavelength**=The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest.  How does changing the length of the sound wave affect the sound produced?