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