Question

Figure 17-1 shows a wave movement during 1 second. What is the frequency of this wave?

A. 2 hertz
B. 2 meters/second
C. 0.5 second
D. 1 hertz

Answer 1

2 cycles/ sec=2Hz

Answer 2

Just providing another way to approach this is using the wave-speed equation:
\[c=\nu\lambda\]The wave moves two wavelengths every second (it says so in the diagram), so:\[c=\frac{2\lambda}{s}\]\[\nu=\frac{c}{\lambda}=\frac{2\lambda \cdot s^{-1}}{\lambda}=2\cdot s^{-1}=2\ Hz\]

Answer 3

thank yall!