Sound Levels, noise and thresholds

By Vinay Shah 8F

What is sound and sound thresholds?

What is Sound?

Sound is a form of energy. Sounds are formed when things vibrate. The vibrations are passed on by particles in solid, liquid or gasses. Sound needs a substance to pass on the vibrations, so it can travel through solids, liquids and gasses but not vacuum.

How are sound waves created?

Sound waves exist as variations of pressure in a medium such as air. They are created by the vibration of an object, which causes the air surrounding it to vibrate. The vibrating air then causes the human eardrum to vibrate, which the brain interprets as sound.

Sound waves

How the sound waves are actually when you hear something from the speaker

What is a sound level

The sound levels are the different levels at which you hear sound. A sound level meter is an instrument that can measure sound level, commonly used in noise pollution studies for the quantification of different kinds of noise, especially for industrial, environmental and aircraft noise
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What are sound thresholds?

The hearing threshold is the sound level below which a person's ear is unable to detect any sound. For adults, 0 dB is the reference level. A threshold shift is an increase in the hearing threshold for a particular sound frequency.

What causes you serious hearing problems?

listening music once in a while is fine but if you listen music daily and really loudly it can cause you really severe hearing problems. Too much of listening to sound can damage your sensitive structures in the inner ear and causes noise-induced hearing loss (NIHL)

Noise and noise pollution

What is Noise pollution?

Noise pollution is a large amount of harmful and annoying level of noise. Noise pollution affects both health and behavior. Unwanted sound (noise) can damage psychological health. Noise pollution can cause hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other harmful effects.
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What causes noise pollution?

The source of most outdoor noise worldwide is mainly caused by machines and transportation systems, motor vehicles, aircraft and trains

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