Two point sources are vibrating producing two-dimensional water wave interference. The third nodal line on either side of the central maximum will occur at locations where the path difference of the arriving waves is: 3λ 2
3λ
​
2λ 2
5λ
​
The wavelength of red light is 6.5x10 −7
m in air. It's frequency is: 2.0×10 2
Hz 4.6×10 14
Hz 2. 2×10 −15
Hz 6.5×10 14
Hz