For a stationary wave to form, two waves have to move through the same region in opposite directions. Which statement about the properties of these two waves must also be true?
- AThe waves must have equal frequency, but a different speed and wavelength.
- BThe waves must have equal speed, but a different wavelength and frequency.
- CThe waves must have equal speed, frequency and wavelength.
- DThe waves must have equal wavelength, but a different speed and frequency.