Sound Flashcards
What is a wave (sound)
They are what transfer energy from place to place. Some must travel through a substance. This substance is called a medium which can be a solid liquid or gas. However sound waves must travel through a substance to carry it which vibrates as the waves are carried.
What is the amplitude of a sound wave?
Maximum disturbance from its undisturbed position. To simplify its from the middle line of the wave to the top of a wave.
What is the wavelength of a soundwave?
This is the distance between a point on one wave and the same point on the next wave.
What is the frequency of a soundwave?
This is the number of waves produced by a source each second.
What are sound waves?
- Sound waves are longitudinal waves
- Their vibrations occur in the same direction as the direction of travel
- Sound waves are vibrations of particles in the air.
- The energy of the vibrating air particles is transferred to nearby air particles, causing them to vibrate as well.
What is the speed of sound?
340/ms
What are compressions and rarefactions?
- Compressions (air particles closer together than usual)
- Rarefactions (air -particles further apart than usual).
What are frequency and pitch?
-The number of compressions (or rarefactions) that reach your ear per second is known as the frequency of the sound.
-Frequency is measured in hertz (Hz).
E.g. The musical note middle C creates 256 compressions every second, so the frequency of this note is 256 Hz.
-The frequency of a sound determines its pitch. The faster an object vibrates, the higher the frequency and pitch.
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What does amplitude do?
-the greater the amplitude, thelouder the sound
How does sound travel?
Sound travel moves via vibrations by air particles meaning it cannot move through an empty space such as space because there are no air particles.
How and why does sound reflection work?
All waves reflect off surfaces including sound waves, this is why you hear sounds that are not always directed straight at you. This is also how echolocation works. Sound reflects better off hard surfaces than soft.
How does sound absorption work? (acoustic)
Acoustic absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body. This means energy is lost via energy absorbtion.
What is faster sound or light?
We see the flash virtually instantaneously because light travels so fast (3×108meters/second).
Sound, on the other hand, travels more slowly (about300meters/second). If the storm is 1.5 km away (1500m)the sound will take about5sto arrive.
