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Dear student,
Relative density is the ratio of density of substance to density of water.
Relative density of mercury = density of mercury density of water
= 13.6 = density of mercury/1000 kg/m3
Density of mercury = 13600 kg/m3
The relative density has no unit as it compared the density of two substances.

Echo ranging is the process of detecting underwater objects using sound signals. The minimum distance between source and the reflecting body should be 17 metres for the formation of an echo. This technique  is used  to measure depth of sea with the help of Sonar.
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14 AND 15 TH QUESTION
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DONOT KNOW SORRY
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15) relative density is the density of substance divided by density of water
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