A cannon is fired from the top of a castle wall. The cannonball is fired at a speed of 45 m/s and an angle of 0◦ above horizontal. Another cannonball that was accidentally dropped hits the ground below in 1.2s. How far from the castle wall does the fired cannonball hit the ground?

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it's a b and

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