|
Which waves are used in the device “SONAR”? |
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(a) |
Audible waves |
(b) |
Ultrasound waves |
|
(c) |
Infrasound waves |
(d) |
Light waves. |
|
Which waves are used in the device “SONAR”? |
|||
|
(a) |
Audible waves |
(b) |
Ultrasound waves |
|
(c) |
Infrasound waves |
(d) |
Light waves. |