A long, straight wire lies along the zz-axis and carries a 3.90-AA current in the +z+z-direction. Find the magnetic field (magnitude and direction) produced at the following points by a 0.400 segment of the wire centered at the origin.

elctricity and magnet is conversion to it

prndulum needs thread, weight clock to time swings

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