Question

answer it correct....? ​

Answer 1

Solution:

Let r1 and r2 be the radii of spherical balloon and spherical balloon when air is pumped into it respectively. So

r1 = 7cm

r2 = 14 cm

Now, Required ratio = (initial surface area)/(Surface area after pumping air into balloon)

= 4r12/4r22

= (r1/r2)2

= (7/14)2 = (1/2)2 = ¼

Therefore, the ratio between the surface areas is 1:4.

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Answer 2

Let r1 and r2 be the radii of spherical balloon and spherical balloon when air is pumped

into it respectively. So

r1 = 7cm

r2 = 14 cm

Now, Required ratio = (initial surface area)/ (Surface area after pumping air into balloon)

= 4r12/4r22

(r1/r2)2

(7/14)2 = (1/2)2 = 14

Therefore, the ratio between the surface areas is 1:4.