Part A What electron current is driven through a 2.3-mm-diameter iron wire by a 0.062 V/m electric field?

We know, Current is given by :

Here, is resistivity and for iron.

Putting in above equation, we get :

Therefore, the electron current is 2.65 A.

Hence, this is the required solution.

answer: a. same unit

explanation:

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