Why is it likely that Bohlin’s design has remained unchanged over the last several years?
A. Bohlin did an excellent job in the selection and design of his criteria.
B. People generally don’t care about safety enough to change the design.
C. Bohlin made a deal with the auto industry that they could not change his design
D. Bohlin keeps revising his own design so no other designs have been introduced.

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