A light balloon filled with helium of density ρHe is tied to a long string of length l and the string is attached to the ground. If the balloon is displaced slightly in the horizontal direction from the equilibrium and released then .
(A) The ballon undergoes simple harmonic motion with ** 2p√(ρair/ρair- ρHe)l/g
(B) The ballon undergoes simple harmonic motion with ** 2p√(ρair - ρHe/ρair)l/g
(C) The ballon undergoes simple harmonic motion with ** 2p√(ρHe/ρair- ρHe)l/g
(D) The ballon undergoes conical oscillations with ** 2p√(ρair + ρHe/ρair- ρHe)l/g
