The volume in the cylinder above the piston when the piston is at the bottom of the stroke (bdc) compared to the volume in the cylinder above the piston when the piston is at the top of the stroke (tdc) is referred to as

The stopwatch used by a student to measure velocity of a pulse in a slinky was of least count 0.1 second. he stops the stopwatch when a pulse has made 3 journeys from one end to the other of the slinky. he finds the seconds hand to be at 52nd division. calculate the correct time noted by him.