Create your own project report on the topics " Audible and Inaudible sounds, Noise Pollution"
(Note: Use A4 sheet for your report and the report should atleast have 10 pages).
Answers
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All the frequencies residing between the limit of 20Hz and 20KHz can be perceived by human beings. Therefore, these sound waves having frequencies within the range of 20Hz and 20KHz are known as audible sound.
Explanation:
What is Sound?
A sound is a vibration propagating or travelling through any medium in the form of a mechanical wave. The medium in which the waves propagate or travel can either be a solid medium, a liquid, or a gas medium. Sound travels the fastest in solid medium, relatively slower than solid in liquids, and slowest among the three in gases. In other words, any vibration that propagates as an audible or hear-able wave of a pressure, through a medium such as a gas, liquid, or solid.
Different Factors Affecting Sound Characteristics
The sound waves produced by a guitar is different from the sound that is produced by a drum. The reason being the sound waves produced by different sources have different characteristics. Sound can also be characterized by its frequency, wavelength, and amplitude.
Frequency of sound
The number of rarefactions of the sound waves and the compressions occurring per unit of time is known as the frequency of a sound wave.
Wavelength of sound
The distance between the successive compression and also the rarefaction of sound waves known as the wavelength of a sound wave.
Amplitude of sound
The amplitude of the sound is referred to as the magnitude of the maximum disturbance in a sound wave. The amplitude is also referred to as a measure of energy. Higher is the amplitude so higher is the energy in a sound wave. Humans can only hear a limited range of frequencies of the sound wave. Physicists found the audio frequency spectrum of the human ear lies between 20 Hz and 20,000 Hz.
Speed of Sound
The speed or velocity at which the sound waves propagate or travel through a medium is known as the speed of sound. The speed of sound is different for different media. The speed of sound is greatest in solids because the atoms in solid are highly compressed whereas least in gases for the same reason of molecular compression which is least in it.