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| Q. |
The instrument which uses sound waves to measure the depth of oceans is – |
| A. | Radar |
| B. | Sonar |
| C. | Altimeter |
| D. | Venturimeter |
| Answer» B. Sonar | |
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Explanation: The instrument which uses sound waves to measure the depth of oceans is sonar. Sound waves can travel much faster from one point to another. Sound waves are far more accurate for measuring these vast distances. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Sonar may also be used in air for robot navigation, and SODAR is used for atmospheric investigations. |
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