When you rub a glass rod with a piece of silk, the glass rod becomes positively charged?

Explanation :

When a glass rod is rubbed with a piece of silk the glass rod becomes positively charged. The charge appears due to the friction. On rubbing the electrons from glass gets transferred to silk cloth.  

We know that the element that loses electron is positively charged and the element which gains an electron is negatively charged.  Thats why the glass rod is positively charged.

Hence, this is the required 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 five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.