AQA Physics Unit3 Module 1 Medical applications of physics minus the eye 2.0 / 5 based on 2 ratings ? PhysicsMedical PhysicsGCSEAQA Created by: Jessica CzinkCreated on: 26-04-13 19:51 X-rays have: A high frequency and short wavelength 1 of 17 What can be used to form electrinic images of X-rays? Charge-coupled devices (CCDs) 2 of 17 X-rays cause ionisation. What should workers do to protect themselves? Where film badges and use lead screens to shield themselves 3 of 17 CT scanners use X-rays to produce digital images of what? A Cross-section through the body 4 of 17 With a contrast medium..... Soft tissue can be seen on an X-ray image 5 of 17 What can also treat cancerous tumors? X-rays 6 of 17 What frequency does sound waves have to be above to be ultrasound? 20,000 Hz 7 of 17 What can be used to produce utrasound waves? A transmitter 8 of 17 When is an ultrasound wave reflected? When a wave hits a boundary between to different materials 9 of 17 To scan foetuses or soft tissue such as the eye. what do they use? Ultrasound 10 of 17 What is the measure of how much a substance a ubstance can refract a light ray? Refractive Index 11 of 17 When a light ray crosses from air into glass how is it refracted? Towards the normal 12 of 17 What is an endoscope used for? To see directly inside the body 13 of 17 When the angle of incidence of a light ray in a tansparent substance produces refraction along the boundary what is it called? The critical angle 14 of 17 What is total internal reflection? When the angle of incidence is increased beyond the critical angle and the angle incidence equals the angle of reflection 15 of 17 Laser light can be used in an endoscope to what? Cut, cauterise and burn 16 of 17 Why can laser light be used in surgery on the retina? It passes through the cornea but is absorbed by the retina 17 of 17
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