The types of the sound waves
The Sound waves
There are two types of the sound waves which are the audible sounds and the non – audible sounds , The audible sounds such as the sonic waves , And the non – audible sounds such as the ultrasonic waves and the infrasonic waves .
The audible sounds
The sonic waves are the sound waves of the frequencies from 20 to 20000 Hz , The human ear transmits the effect of such waves to the brain which translates them into the sound and the audible tones .
The non – audible sounds
The infrasonic waves are the sound waves of the frequencies less than 20 Hz , The human ear can not hear the infrasonic waves , And these waves accompany the blowing of the storms that preceding the rainfall .
The ultrasonic waves are the sounds waves of the frequencies higher than 20000 Hz , The human ear can not hear the ultrasonic waves and some animals such as the bats , the dogs and the dolphins can hear them .
|whales can hear the ultrasonic waves .|
The human ear can hear the sounds of the frequencies ranging from 20 to 20000 Hz as the ear transmits the effect of these waves to the brain which translates them into the sound and the audible tones .
Some sound waves can not be heard as the frequencies of these waves are lower than 20 Hz or more than 20000 Hz , So the human ear can not hear them as the effect of such waves can not translated by the brain into the audible tones .
The applications of the ultrasonic waves
The ultrasonic waves are used in the military field to discover the landmines , The ultrasonic waves are used in the industrial field in the sterilization of the food , the water and the milk as it is characterized by its high ability to kill some types of the bacteria and stop the action of some viruses .
|The ultrasonic waves are used in Sonar .|
The ultrasonic waves are used in the medical field to break down the kidney and the ureter’s stones without any surgical intervention , They are used in discovering the malignant tumors , And they are used in the diagnosis of the male prostate gland tumors and its effect on the bladder .