1Mhz
pulse signal which is generated from the circuit board and transformed into
optical signal is transmitted through a fiber-optic cable. Calculate a sonic
speed with both of that pulse signal generated from the circuit board and of
that optical signal transmitted through 20m fiber-optic cable.

Panel(1) : 170 x
90 x 15 mm

Optical Fiber(3) : 50cm(A), 10m(B),
25m(C)

Adaptor(1) : 9V
300mA

Connection Lead(2)