This question already has an answer here:

A week ago I contacted a potential supervisor with shared interests. He answered back on the same day, positively reflecting his will to cooperate and support my application. I replied to him on the second day with a draft of the aimed project. It has been a week since that email and there has been no answer or reply. Should I assume that he is no longer interested?! Or should I wait a bit longer?!

marked as duplicate by jakebeal, Peter Jansson, David Richerby, scaaahu, aeismail Jan 6 '15 at 6:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.