28. IE ••

(a) If the mass in an oscillating mass-spring system is halved, the new period is (1) 2, (2) 2 , (3) 1 2, (4) 1/2 times the old period. Explain.

(b) If its initial period is 3.0 s and the mass is reduced to 1/3 of its initial value, what is the new period?