Question

✌✌solve this one plzz ✌✌

Answer 1

We know that :

T = 2π √( l / g )

Solve using differentiation :

dl = 1

db = ?

Now :

√2 T = 2π ( √( l / g ( 1 - dl / db ) )

==> √2 T =  T ( √ 1 / 1 - dl / db )

Cancel T both sides

==> √2 = 1 / √ ( 1 / 1 - dl / db )

==> 2 = 1 / ( 1 - dl / db )

dl = 1 [ given ]

==> 2 = 1 / ( 1 - 1 / db )

==> 2 = db / ( db - 1 )

==> 2 db - 2 = db

==> db = 2

Hence the density is 2

ANSWER :

OPTION B

Hope it helps !

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Answer 2

option b is ur answer..!!!!