Can someone help me please? im so confused! Two sailboats are anchored 10.0 m apart. As a series of waves passes, the boats bob up and down but when one is up, the other is always down. What wavelength wave could produce this effect? Explain. (If you can come up with more than one answer, use the largest one.)

there are no contact forces mentioned on the list of choices that you've provided.

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m