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Option 1 : 1 only
P wave are like Sound waves and can travel in all the three mediums of solid, liquid and gas. Hence statement 1 is correct.
S waves can only travel in solid medium and cannot travel in liquid and gaseous medium. Hence statement 2 is incorrect.
Velocity of P waves is in proportional to density of medium and hence it decreases as it enters from denser to rarer medium or solid to liquid medium. Hence statement 3 is incorrect.
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