Carhart's notch seen at:: (A) 0.5 KHz, (B) 1 KHz, (C) 2 KHz, (D) 4 KHz
Answer is C. Ans: c (2 KHz) Ref: Dhingra, 3rd ed, p. 115 & p. 87Dip in bone conduction in otosclerosis & maximum occurs at 2000 Hz called Carhart notchDip Disappears after successful stapedectomy2 KHz dip - Otosclerosis4 KHz dip - Noise induced hearing loss8 KHz dip - Senile otosclerosis