You're missing a crucial piece of information: the frequency of the wave. To calculate the speed of a wave, we need both the wavelength and frequency.

Here's the formula to calculate the speed of a wave:

Speed (v) = Wavelength (λ) * Frequency (f)

Let's assume the frequency is 10 Hz (you'll need to replace this with the actual frequency given in your problem).

Calculation:

* Wavelength (λ) = 0.5 meters

* Frequency (f) = 10 Hz

* Speed (v) = 0.5 meters * 10 Hz = 5 meters per second

Therefore, if the frequency of the wave is 10 Hz, it's moving at a speed of 5 meters per second.

Remember: Replace the frequency (10 Hz) in the calculation with the actual frequency provided in your problem.