Rainbow 🌈 mind map
● Production Of Sound:
- The sound is produced by vibrating objects. NO vibration NO sound.
● Different ranges of sound:
- Audible range = 20Hz to 20kHz known as the Sonic range
- Below 20 Hz (inaudible) → infrasonic range
- Above 20 kHz (inaudible) → Ultrasonic range
● Sound in different media:
sound travels most quickly through solids, followed by liquids, and then by gases.
They are molcules of matter helping sound to move from one place to another Molcules of matter are closest together in solids and farthest apart in gases.That is why speed of sound maximum in solids and least in gas
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● Sound as longitudinal wave:
- Longitudinal waves – In this type of wave, the movement of the particle are parallel to the motion of the energy i.e. the displacement of the medium is in the same direction to which the wave is moving. Example – Sound Wave
Longitudinal wave comprises Compression and rarefraction
● Terms related wave:
Amplitude (A): The amplitude of a wave is the maximum displacement of any particle of the medium from its mean position.
Period (T): Period (T) of a wave is the time taken by any particle of the medium to complete one vibration .
Wavelength (λ): Wavelength (λ) - It is equal to the distance travelled by the wave by its time period (T).
Frequency (f): It is the number of vibrations made per second by any particles of the medium
f = 1/T
● Characteristics of Sound:
● Echo( Reflection of light )
It is the distinct sound heard after reflection from distant rigid surface.
To hear the echo clearly in air, the reflecting surface should be at a minimum distance of 17 m from the source of sound.
To know more go to my post sound energy or wave
