Finally, the water park at an amusement park has rides that are essentially this lab on a large scale. A 45 kg rider falls a total distance of 22.5 m for one of these, sliding down an incline of 31.5 degrees. If there were no friction, how long would the ride last (while they are in the tube?) How fast would they exit the tube in m/s?

correct it is c.) b b

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