Which phrase best describes the path of a light wave? A. Parallel to the source
B. Perpendicular to the source
C. Spiraling around the source
D. Straight away from the source

Ithink it’s 3 as the answer.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf