The effect of echo in locating the position of surfaces and barriers
Some animals use echoes to locate and identify the objects , The echolocation is used for navigation and for foraging ( hunting ) in various environments , The bats can use the phenomenon of sound reflection ( echo ) in their daily life to locate the position of their preys , and fly in the dark without colliding with anything .
The bats transmit ultrasonic waves of frequencies ( 50 : 100 KHz ) that reflect on the surfaces and barriers then receive them back after reflection , and locate their positions , so they avoid colliding them .
The bats generate ultrasonic waves via the larynx and emit the sound through the open mouth or the nose , The bats make high pitched chirps which are too high for humans to hear , the bats identify the location of objects by the echolocation .
The bats use the echolocation to find their food and their way , So they can determine the direction of an object , how far it is , how fast it is , and how big the objects is by making sharp clicking and chirping sounds through their mouth and nose .
The dolphins can hear ultrasonic waves and use them to orient and capture the preys , man can not hear sounds produced by the dolphins as the dolphins produce sounds up to 120 kilohertz , while man can hear sound of frequencies up to 20 kilohertz only .
The dolphins can hear sounds up to 150 kilohertz , and they use a feature called echolocation to create acoustical pictures of their surroundings , The dolphins use the echolocation to find the walls , other big animals and other dolphins .
The dolphins are able to produce intense , short , broadband pulses of ultrasonic sound ( clicks ) , they use short pulses and high frequencies using clicking and whistles which sent out of an opening below their blowhole .