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Units and Measurement
Question
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What is echo method of measuring the large distances?

Answer

Echo method: an echo is the phenomenon of repetition of sound on reflection from an obstacle. 
In echo method, a wave (sound or electromagnetic) is sent towards the object and then reflected wave is again received back at the same position. Knowing the speed of wave and time after which reflected wave is received, the distance from which wave is reflected can be calculated. 

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Some More Questions From Units and Measurement Chapter

What is the need of measurement?

Define physical quantity.

 

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?