The machine have mechanical advantage 2 . what does it mean

this statement actually refers to that every machine every machine which is in this world is used to measure something or kind of instrument has its advantages and disadvantages so there are mechanical advantages and mechanical disadvantages that is why a machine has mechanical advantage as well as mechanical ...

Explanation:

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.