The frequency of the waves produced by the vibrating bar of a ripple tank is:
a) 5 Hz
b) 10 Hz
c) 15 Hz
d) 20 Hz

The period of the waves produced by the vibrating bar of a ripple tank is:
a) 0.1 seconds
b) 0.2 seconds
c) 0.5 seconds
d) 1 second