Advertisements
Advertisements
Question
Define the following terms : (a) Echolocation (b) Echocardiography, and (c) Ultrasonography.
Advertisements
Solution
(i) Echolocation: It is the method used by some animals to locate the objects by hearing the echoes of their ultrasonic squeaks. This method is used by bats and dolphins in finding their way and detecting their prey.
(ii) Echocardiography is a method used to investigate the action of the heart by using ultrasound waves.
(iii) Ultrasonography is a technique of obtaining pictures of internal organs of the body by using echoes of ultrasound pulses.
APPEARS IN
RELATED QUESTIONS
How is ultrasound used for cleaning?
Explain the working and application of a sonar.
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
What happens to the pitch of a sound if its frequency increases ?
Fill in the blank with suitable word :
Quality of sound depends on ........................
Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.
What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?
What is sonar ? Explain its use.
A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440 m/s).
What type of waves are generated by SONAR device fixed to a fishing ship ?
