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
Give two practical applications of reflection of sound waves.
Explain how bats use ultrasound to catch a prey.
Explain the term 'amplitude' of a wave. Draw the diagram of a wave and mark its amplitude on it.
Name the unit used to measure the loudness of sound. Also write its symbol.
Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).
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).
In SONAR we use:
The ultrasound waves can penetrate into matter to a large extent because they have :
Expand the abbreviation of the term SONAR.
