Question

Explain about the characteristics of sound.

Answer 1

♦ Vibrations


Sound is generated by vibration of some type of body. Sound is a physical phenomenon. Acoustics is the part of physics that analyzes this phenomenon.


♦ Transmission medium

The sound needs to be transmitted from some medium, this can be solid, liquid or gaseous.


♦ Spread energy[Loudness].


Sound is a wave that propagates energy.

♦ Intensity


Sound has intensity. Intensity refers to the force with which it is perceived, which depends on the amplitude of the oscillatory movement. Subjectively, we say that a sound is strong or weak. When we raise the volume of the radio, what we do is increase the intensity of the sound. The intensity is measured in decibels. 


♦ Tone or height


The sound has pitch (or height). The tone of a sound depends on its frequency, that is, the number of oscillations per second. The higher the frequency, the sharper the sound, the less frequently we will have a more serious sound.

♦ Doorbell[timbre]


The sound has a timbre. The timbre is what allows to differentiate the emitting focus of the sound and depends on the characteristics of the source of that one. Thanks to the timbre we can distinguish sounds, even if they have equal intensity and tone (for example, we are able to distinguish human voices from each other, the sound of different musical instruments, etc.).

♦ Duration


Sound has duration. It refers to how long the vibration lasts; It can be long, like a fireman's siren, or short, like a snap of fingers.

♦ Echo


The sound can be reflected. It is what we know as an echo and occurs when the vibrating wave encounters surfaces perpendicular to its path. These reflective surfaces must be separated from the sound source by more than 10 meters.

♦ Hearing Aid
The sound is perceived through the operation of the hearing aid. In the interior of our ears, the sound waves make move small components called vesicles that transmit the movement of the eardrum to the inner ear. The inner ear is then responsible for transmitting signals to the brain, through the nervous system.

♦ Speed ​​of sound


The speed of sound is the speed at which sound waves propagate, under certain known conditions of temperature, in a given medium. The more solid the medium through which the sound travels, the faster it will be. Also, the higher the temperature, the sound will travel better.

In the air, if we consider 50% humidity in the environment, a temperature of 20 degrees centigrade, and altitude at sea level, the speed of sound is 1235 km / h or 343 m / s. Under the same conditions, but below water, the speed of sound is much faster, about 4.5 times faster.

Answer 2

Hi there Bella !!!

First of all lets see :-
"What is Sound "
and
"How is it Produced "

⇒Sound is a form of Energy

⇒Sound Wave is longitudinal wave [ particles of the medium vibrate parallel to the direction of propagation of wave ]

⇒When an object vibrates, it produces sound

⇒Sound is produced by clapping of palms.

⇒Sound can be produced by vibrating a string.

⇒Sound can be produced by beating a table

⇒Hence , it is clear that sound is produced , when an object is vibrating

====================================

Characteristics of Sound Waves :-

⇒Wavelength
The length of one wave is referred to as wavelength.
Wavelength = Distance between tow consecutive crests or troughs
Its SI Unit is Metre

⇒Frequency :-
Frequency is the number of waves formed in 1 sec.
When the frequency of a sound is more , the sound will have high pitch.
Also , when frequency is less , the pitch will be low
SI Unit of Frequency is Hertz(Hz)
The audible range for human ear is 20Hz to 20kHz(20000 Hz)
Pitch :-How the brain interprets an emitted sound is known as pitch



⇒Time Period :-
Time required to produce one complete wave is called time period [ T ]
Its SI Unit is seconds

Frequency = 1/Time period

⇒Amplitude :-
Maximum displacement to either side of mean position is known as amplitude.
When amplitude is higher , the sound will be louder .
Also , when ampltiude is less ,sound will me not loud
SI Unit of amplitude is meter

⇒Velocity of sound :-

The distance traveled by the sound wave in unit time is called velocity of sound wave

Velocity = Frequency × Wavelength

SI Unit of velocity is m/s