Based on latest US News rankings which certainly isn’t the be all end all predictor for admissions difficulty. It
may give a rough idea . Of course you then have to factor the overall competitiveness of the school. Colgate and CWRU agree are reaches and u-grad only I believe. Only found graduate rankings but u-grad should be similar.
Physics Ranking:
25 - Penn State
44 - U Rochester
56 - UMass & RPI tied
61 - Brandeis
71 - UConn
91 - Drexel
146 - URI & WPI tied