Correct Answer - Option 3 : Sonar
The correct answer is Sonar.
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An apparatus used for locating submerged objects is known as Sonar.
- SONAR (an acronym for Sound Navigation and Ranging) is used to detect underwater targets.
- Like radar, used to detect long-range aerial and other targets.
- sonars have applications in underwater surveillance, communication, and marine navigation.
- It is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves.
- There are two types of sonar -
- active sonar
- passive sonar
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Radar:
- Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects.
- The term RADAR was coined in 1940 by the United States Navy as an acronym for "Radio Detection And Ranging".
- The term radar has since entered English and other languages as a common noun, losing all capitalization.
- Radars today are used to detect and track aircraft, spacecraft, and ships at sea
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as well as insects and birds in the atmosphere; measure the speed of automobiles; map the surface of the earth from space; and measure properties of the atmosphere and oceans
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Pulsar:
- A pulsar is a rapidly spinning neutron star – the remnant of a supernova explosion.
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Quasar:
- A quasar is in fact a distant galaxy with a fluctuating blaze of light and other radiations coming from its central regions.
