- Sound is kind of energy.
- Sound produced due to vibration.
- Speed of sound in air 332 m /s
- Speed of sound in water 1483 m /s
- Speed of sound in iron 5130 m /s
- Solid liquid and gaseous media are required for sound propagation.
- Speed of sound is maximum in solid and minimum in gases.
- Sound cannot travel through vacuum.
- Sound passes from one place to another place is from of wave.
- Sound waves travel different speed different medium.
- Speed of sound remains unchanged by the increase or decrease of pressure.
- Sound waves are longitudinal mechanical waves based on their frequency range.
SOUNDWAVE DIVIDED INTO THREE CATEGORIES
AUDIBLE WAVES
- This sound wave frequency range between 20 Hz to 20000 Hz.
INFRASONIC WAVES
- This sound waves having frequencies less than 20 Hz.
ULTRASONIC WAVES
- This sound waves having frequencies greater than 20000 Hz.
- Infrasonic sound and Ultrasonic sound we do not hear.
- We don't hear if there is an explosion on Moon or another planet because there is no mass between the them and the earth.
- Particles of the medium do not displace during the propagation of sound waves this is wave property of sound
- The number of times a periodic motion vibrates full per second is called the Frequency.
Echo is reflection of sound, this is use to
- Measure the depth of the Ocean,
- Determine the height of an Aircraft,
- Determine the speed of sound in the Air.
