It depends what the sentence is. Affect is a verb, effect is a noun.
Eg. The blast affected her health. The effects of the blast were catastrophic.
You say 'profound effect'
The word EFFECT, since it is a noun. It means a result or change.The word AFFECT is normally a verb, meaning to influence or make a change.The two are often confused. As a rarely-used verb, effectis used almost exclusively with the word "change". As a rarely-used noun, affect has a psychological meaning.Example:"We did not know what the effect would be, or how it would affect the subject."
"You have absolutely no effect on me." In general, the word "effect" is a noun and the verb is "affect". For example, "Your bad behavior does not affect me." However, "affect" is a noun when it refers to a person's facial expression or demeanor. For example "that man appears depressed because he has a flat affect."
the right word is "affect."
(The verb effect is only used to mean "make a change." Otherwise use "affect".)"The treatment may effect a modification in his behavior.""The law is designed to effect a major change in land use."
Example sentence - Your behaviors have direct cause and effect.
Ten families were effected by the storm. The storm affected ten families.
Affect is a verb form of the common word "effect." Therefore, you would use the word "affect" when something is changing, or having an action performed upon it, i.e. "Johnny was greatly affected by the severing of his leg." Meanwhile, you would use the word "effect" as a noun form of the word, i.e. "The effect of Johnny's leg being severed was that he fell over a lot more frequently."
From the journalism and marketing stylebooks, we're taught that effect is more commonly a noun indicating a result ("a side effect") while affect is more often a verb ("it affected me deeply"). How well you study the material will affect your grade on the final test.
Example sentence - We are learning to what the doppler effect is and how to use it.
my contributions affect everyone in my organization.
When you use effect you would use it after an event where there was a cause. When you use affect is when it changes somebody's attitude or changed something. ~Your favorite answerer, YASMIN :D o3o