Two identical 1500 kg cars are traveling at 15 m/s in a straight line. Car A slams on its brakes and slows to a stop in 1.95 seconds. Car B brakes slowly and stops in 5
seconds. Which car has the greater change in momentum? *

c.the charges if the proton and electron and gravity

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