# A wave of wavelength 2m is reflected from a surface. If a node is fromed at 3m from the surface, then at what distance from the surface, another node will be formed?
1. 1m
2. 2m
3. 3m
4. 4m

### Asked by Mamali Nanda | 14th Jul, 2016, 07:24: PM

Expert Answer:

### A node is a point on the wave where the amplitude is minimum.
Now, in a wave a node appears after every half the wavelength. So, if the wavelength is 2 m then the node will appear after every 1 m.
Hence, if we look from the surface, a node will be formed 1 m from the surface.
Similarly, a node will be formed at 2 m, 3 m, 4 m, and so on.

### Answered by Romal Bhansali | 15th Jul, 2016, 04:09: PM

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