What is pure and impure spectrum?

What is Pure line?

What is spectrum?

What is an impurity defect?

What is meant by 'broad spectrum antibiotics.

What is pure culture?

What is the action spectrum of transpiration ?

What is an impurity defect? What kind of impurity defect is generated in a NaCl crystal when it is doped with a small amount of SrCl_(2) ? Calculate the number of cation vacancy per Sr^(2+) ions is this crystal?

(1) What is meant by line spectra of atom ? (2) How many lines are observed in the visible region of hydrogen spectrum?

What are the types of spectrum?

Differentiate between absorption spectrum and action spectrum.