28. which of the following statements is true? a. an ideal metal conducts because each electron ‘belongs’ to every nucleus in the crystal lattice, while in an ideal insulator, each electron is localized to a single nucleus. b. metals conduct much better than insulators because, per gram of material, metals have orders of magnitude more electrons. c. at sufficiently low temperatures, (intrinsic) semi-conductors are effectively insulators.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

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