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Q.

When a metal sphere is heated, its volume increases by 50c.c and its surface area increases by 25cm2. Its initial radius is

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a

1.2cm

b

1cm

c

4cm

d

3cm

answer is C.

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Detailed Solution

ΔA=AβΔt=25ΔV=VγΔt=504πr22α43πr33α=12r=4cm

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When a metal sphere is heated, its volume increases by 50c.c and its surface area increases by 25cm2. Its initial radius is