A model of a standing wave

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Notice three waves: a faint grey wave moving to the left a yellow wave moving to the right a magenta wave that is the superposition of the two waves. Click on the image for a larger image (429kb)

1. How many nodes do you see? 6
2. How many antinodes? 5
3. What is the frequency of the grey and yellow waves? about 0.1 Hz
4. What is the period of the magenta wave? about 10 s