A long wire with a radius of 0.400 cm carries a current. The potential difference across a 2.90 m long section of this wire is 13.0 V, and the wire carries a current of 0.360 A. Required:
a. What is the resistance in Ω of the 3.20 m long section of wire?
b. What is the resistivity of wire?

its c its is a mixture of gases

yup its correct its: c) b b

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