ï»¿ A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locateobjects under water. In a submarine equipped with a SONAR the time delay betweenÂ generation of a probe wave and the reception of its echo after reflection from anÂ enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine?(Speed of sound in water = 1450 m s â€“1). from Physics Units and Measurement Class 11 Manipur Board

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A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate
objects under water. In a submarine equipped with a SONAR the time delay betweenÂ generation of a probe wave and the reception of its echo after reflection from anÂ enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine?
(Speed of sound in water = 1450 m s â€“1).

Let the distance between the ship and the enemy submarine be â€˜Sâ€™.

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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory.
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity.
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Define unit.

The quantity used as a standard of measurement is called unit.

Example: Unit of time is second.

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
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Define physical quantity.

A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.

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