An astronaut on a planet with no atmosphere drops a feather into a 7.97m deep crater and records that the feather falls freely for 2.02s. What is magnitude of free-fall acceleration on the planet?
With what speed does the feather strike the bottom of the crater?

trig 15.3 cos

answer; how far out of place which the object finished relative to the starting location;

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