In the following four periods

(i)   Time of revolution of a satellite just above the earth’s surface(T_st)

(ii)  Period of oscillation of mass inside the tunnel bored along the diameter of the earth(T_ma)

(iii) Period of simple pendulum having a length equal to the earth’s radius in a uniform field of 9.8 N/kg(T_sp)

(iv) Period of an infinite length simple pendulum in the earth’s real gravitational field(T_is)

(a)  T_st>T_ma                         (b) T_ma >T_st

(c)   T_sp< T_is                          (d)   T_st  = T_ma   = T_sp =  T_is

Answer:c