Factors on which its period depends are :
(a) Period of simple pendulum is directly proportional to the square root of its length
i.e., ` " " T prop sqrt L `
( b ) Period of simple pendulum is inversely proportional to the square root of acceleration due to gravity.
i.e., ` T prop ( 1 ) /( sqrt g ) `
Numerical :
Given : ` " "E = pi sqrt 2 T `
` E = T Delta A `
` E = 4pi r ^ 2 T" " [ because Delta A = 4pi r ^ 2 ] `
` pi sqrt 2 T = 4pi r ^ 2 T `
` 2 sqrt 2 r^ 2 = 1 `
` therefore " " r ^ 2 = ( 1 ) /( 2 sqrt 2 ) `
` rArr r = (( 1 )/ ( 2 sqrt 2 ))^ ( 1//2) = 0.5946 `
` therefore ` Diametre , ` d = 2 r `
` = 2 xx 0.5946 `
` = 1.1893 m `