how much of a 500 g sample of potassium-42 is left after 62 hours? the half life of k-42 is 12.4 hours

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

Will a solution form when the solvent and solute are both nonpolar? a. not likely b. never c. most likely

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?