A point on a wave has a period of 0.20 s. The wavelength is 8.0 cm. What is the wave speed?
1.6 m/s1.6\ \mathrm{m/s}1.6 m/s
0.40 m/s0.40\ \mathrm{m/s}0.40 m/s
40 m/s40\ \mathrm{m/s}40 m/s
0.016 m/s0.016\ \mathrm{m/s}0.016 m/s