1 The diagram shows an unbalanced rod. Two loads X and Y can be moved 2 points along the rod. The rod turns in a clockwise direction as shown. Which
action could make the rod balance? *
rod
х
у
movement
of rod
movement
of rod
pivot
moving X to the left
moving X to the right
moving Y to the right
moving the pivot to the left

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