The magnetic field intensity in a plane wave that propagates in the negative y direction in space has two components. One has amplitude 2 A/m and is in directed in the positive x direction, the other has an amplitude 4 A/m and is directed in the negative z direction. In addition, the z-directed component, lags behind the x-directed component by 45º. Find the polarization of the wave, including its sense of rotation, if any.

answer: b.

explanation:

it is b. absorbs thermal energy

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