📲 Live classes with Sir Mahad Amer — A Level Physics 9702. WhatsApp: wa.me/message/CKEDMPETUF4KA1 Topic 24 Medical physics for Cambridge International A Level Physics 9702 (A2), 24.1 Production and use of ultrasound: the piezoelectric effect and ultrasound transducers, specific acoustic impedance, the intensity reflection coefficient, attenuation I = I0e^(−μx) and why a coupling gel is used, plus solved 9702 Paper 42 ultrasound questions. Taught by Sir Mahad Amer in Urdu with English exam terminology. 📘 Free notes & past-paper guides: sirmahadamer.com/resources/