Lithium has a work function of 2.3ev. If 400nm light is incident on it, what is the maximum kinetic energy ? Chemistry Bohr Model of the Atom Calculations with wavelength and frequency
No. A comma precedes such as when what follows is an example of whatever went before. In this case, it is nonrestrictive. (For nonrestrictive constructions: use a comma.).
Put a Comma before a Conjunction If It Joins Two Independent Clauses. Words like and, or, and but are known as conjunctions. This page is about conjunctions that are used to merge two standalone sentences (or independent clauses as they're really called) into one using a conjunction. This is a very common practice.