Two metallic rod of the same material but of different lengths are heated. smaller rod has circular area of cross section but larger rod has rectangular cross section. will their linear expansivity be the same or different? give justification

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

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 force on the thing and the distance the force moves the thing

volts times amps 6 x 0.5 3w