Presentation on theme: " Making Sound Waves: A sound wave begins with a vibration. How Sound Travels: Like other mechanical waves, sound waves carry energy through a medium."— Presentation transcript:
Making Sound Waves: A sound wave begins with a vibration. How Sound Travels: Like other mechanical waves, sound waves carry energy through a medium without moving the particles of the medium along.
Reflection: Sound waves may reflect when they hit a surface Diffraction: Sound waves can also diffract, bend around corners, this is why you can hear someone talking around the corner before going around the corner. Interference: Sound waves may meet and interact with each other.
Elasticity : If you stretch a rubber band and then let it go, it returns to its original shape; However, when you stretch modeling clay it stays stretched. Elasticity is the ability of material bouncing back after being disturbed. Density: Density is how much matter, or mass there is in a given amount of space, or volume Temperature: In a given medium, sound travels more slowly at a lower temperature. At a low temperature the particles of a medium more move slowly then at a high temperature.
Energy of a Sound Wave: In general, the greater the energy used to make the sound, the louder the sound. Distance From a Sound Source: Loudness increases the closer you are to the sound source. Measuring Loudness: The loudness of different sounds is compared using a unit call the decibels (dB).
Pitch and Frequency: Sounds with a high frequency have a high pitch, sounds with a low frequency have a low pitch. Changing Pitch: Pitch is an important property off music because music usually uses specific pitches called notes.
What Causes The Doppler Effect: When a sound source moves, the frequency of the waves changes because the motion of the source adds to the motion of the waves. What Causes Shock waves: When the plane travels almost as fast as the speed of sound the sound barrier is broken
Fundamental Tones and Overtones: You may recall that standing waves occur when waves with just the right frequency interfere as they reflect back and forth. Resonance : Resonance affects the sound quality of a musical instrument by increasing the loudness of certain overtones.
Stringed Instruments: The guitar and violin are stringed instruments. Wind Instruments: Wind instruments include brass instruments; such as trumpets and woodwind instruments such as clarinets. Percussion Instruments: Percussion instruments include drums bells cymbals and xylophones.
Acoustics is used in the design of correct halls to reverberation and interference.
Outer Ear: The outer part of your ear acts as a funnel and collects sound. Middle Ear: Behind the ear drum is the middle ear, the middle ear contain 3 of the smallest bones in your body called the hammer, the anvil, and stirrup. Inner Ear: A membrane separates the middle ear form the inner ear; the third section of the ear.
Causes of Hearing Loss : Hearing loss can occur suddenly if the eardrum is damaged or punctured. Hearing Aid: For some types of hearing loss the hearing aids can restore some ability to hear.
Microphone: The microphone converts acoustic sound energy into electrical energy. Some hearing aids use two microphones to help separate background noise. Processor: The processor digitizes the acoustic sound, then separates background noise from speech. Both are processed to make speech clearer and to reduce the interference of background noise. Amplifier: The amplifier boosts the processed signal according to the pattern and severity of your hearing loss, as well as the amount of background noise. Speaker: The speaker converts the electrical signal back into acoustic sound and directs the sound into your ear canal. Some models have the speaker placed in your ear canal. Some use a tube that connects the speaker to plug or custom ear mold. Others have the components housed in a custom-fitting shell. Battery compartment: The battery powers the electronic components. The battery compartment is used to turn the hearing aid on and off. Optional controls: Some models have a volume control to regulate the volume. Others have a program control, enabling you to change the processing for different listening situations, such as high background noise or music. These controls are available on the hearing aids or on a remote control.
Bats: Bats can use ultrasound waves with frequencies up to 100,000 Hz to move around and hunt. Dolphins, Porpoises, Whales: Dolphins, porpoises, and whales something have to hunt in the darkness so like the bats they use echolocation ultrasounds up to 150,000 Hz.
Sonar: A system that uses reflected sounds wave to detect and locate objects underwater is called sonar. Ultrasound Imagine: Doctors use ultrasound imaging to look inside the human body.