Two identical balls A and B each of mass 0.1 kg are attached to two identical massless springs. The spring mass system is constrained to move inside a rigid smooth pipe bent in the form of a circle as shown in the figure. The pipe is fixed in a horizontal plane. The centres of the balls can move in a circle of radius 0.06 m. Each spring has a natural length of 0.06p m and force constant 0.1N/m. Initially both the balls are displaced by an angle \[\theta =\pi /6\] radian with respect to the diameter \[PQ\] of the circle and released from rest. The frequency of oscillation of the ball B is

• A. \[\pi \,Hz\]
• B. \[\frac{1}{\pi }Hz\]
• C. If assertion is true but reason is false.
• D. \[\frac{1}{2\pi }Hz\]