Read the problem to answer questions 17 and 18.

Suppose you observed an anchored boat rise and fall once every 10 seconds as waves whose crests are 25 meters apart pass by it.

17. What is the frequency of the observed waves?
a. 0.15 Hz
b. 0.1 Hz
c. 1.0 Hz
d. 1.55 Hz

18. What is the speed of the waves?

a. 2.5 m/s
b. 250 m/s
c. 25 m/s
d. 2.5 m/s