Why some materials allow to flow more easily than others

Explanation: Typically, atoms are 'reluctant' to let go of their electrons, and this makes them bad conductors, and more like insulators. However, some atoms have their electrons bound loosely, and electricity can flow easily, make these types of atoms best of conducting electricity.

answera compound;

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