Interesting Facts about Sound: A complete guide to understand basics 

Here is a complete  guide to understand the phenomenon of sound


Introduction to Sound:

A sound is a form of energy; things produce when they vibrate and move back and forth very quickly. If we bang a drum, we make the tight surface vibrate at very high speed, however, it is so fast that we can’t usually see it with naked eyes. This forces the air all around to vibrate as well. When the air moves it carries energy out from the drum in every direction.

Eventually, even the air inside our ears starts vibrating—and then we begin to perceive the vibrating drum as a sound. In other words, there are two different aspects to sound; i.e. a physical process that produces sound energy, and sends it shooting through the air. Apart from it,  there is a specific psychological process that occurs inside our ears and brains, which convert the incoming sound energy into sensations, then we interpret then as noise, music or speech.

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How sound travels?

Sound travels in the form of OD mechanical waves. A mechanical wave can be defined as a disturbance that moves and transports energy from one place to another place, through a medium. In the scenario of sound, the disturbance is any vibrating object, and the medium can be any series of interactive and interconnected particles. This means that the sound can travel through solids liquids or gases. The harder the vibration is, the louder the sound will be.

 Reflection of sound:

All Surfaces reflect sound waves. Those which are Hard surfaces reflect sound very well making echoes, and the Soft surfaces, like curtains and carpets, reflect sound in very little amount. They absorb the sound, so there are no echoes produced.

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 Speed of sound:

The speed of sound is the term used to describe the speed of sound waves passing, through a given medium. The speed of waves varies with the medium employed. For example, sound waves travel faster through water than the air, as well as with the properties of the medium, especially temperature. Humidity has a little impact on the speed of sound.

At sea level, at  the temperature of 21° Celsius and with normal atmospheric conditions, the speed of sound recorded as 344 m/s.

How to measure sound? 

Sound energy travels in waves and measured in frequency and amplitude. Amplitude measures that how forceful the sound wave is. It is measured in decibels or dBA. 0 dBA is the softest level that a normal person can hear. Normal speaking voices are approx 65 dBA. A rock concert can reach about 120 dBA. Sounds that are 85 dBA or above can permanently damage our ears.

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