<prompt> Carharts notch dips at:2 Hz200 Hz2000 Hz2000 MHz  <response>: Ans. c 2000 Hz Carhart Notch is an audiogram finding and is an important feature in patients with Otosclerosis. There is a sudden dip notch at 2000 Hz in bone conduction curve. Carhart s notch disappears after stapedectomy. 