# Question on wave length

1. Nov 11, 2009

### mustang1988

1. Water waves having parallel crests 2.0 cm apart pass through two openings 5.2 cm apart in a board. At a point 2.0 m beyond the board, at what angle relative to the "straight-through" direction would there be little or no wave action?
a)closest position to the "straight through" line
b)next closest position from the "straight through" line

2. x=L$$\theta1$$=L($$\lambda$$/d)

3. I was just wondering where to get the wave length from? Would it be 2 since it is 2cm from crest to crest? thanks