Please Help AND NO LINKS OR U WILL BE REPORTED!! This diagram shows the magnetic field lines near the ends of two magnets. There is an error in the diagram.

Which change will correct the error in the diagram?

A.) changing the N to S
B.) reversing the arrows on the left to point toward the N
C.) changing the S to N
D.) reversing the arrows on the right to point toward the S

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Could someone . i have tried to solve myself but my calculation is off