Physics Assignment Medical Imaging - 1672 Words

Kathleen Anne Maguire 1/12/2016 Physics Assignment Medical Imaging MDPMS 1. Sound is travelling from material 1 to material 2. The density of material 1 id 25 kg ms-3 and the density of material 2 is 18 kg m-3. The speed of sound in material 1 is 1900 ms-1 and in material 2 is 18 kg m-3. The speed of sound in material 1 is 1900 ms-1 and in material 2 it is 700 ms-1. The acoustic impedance of each material Z= pV Acoustic impedance (Z) Density is (p) Acoustic Velocity (V) For material 1, 25kgms-3 x 1900ms--1 = 47500 kgm-2s-1 For material 2, 18kgm-3 x 700ms-1 = 12600 kgm-2s-1 The fraction of sound that is reflected Z1 = 47500kgm-2s-1 Z2 = 12600kgm-2s-1 = 12600 – 47500 = 0.3372111373 12600 + 47500 = 0.34 The percentage of sound that is transmitted IR = 17/50 T = 1 – R T = 1 – 17/50 T = 33/50 = 0.66 (X100) = 66% 2. a. Define acoustic impedance The units for acoustic impedance are kgm-2s-1 Acoustic impedance is the ratio of pressure over an imagined surface, in a sound wave to the rate of partial flow across it’s surface. Acoustic impedance can be used to determine the reflection and the transmission of sound. b. Explain either what effect the density of a material, or the frequency of the sound would have upon the attenuation of sound travelling through that material. (Chose one or the other) Attenuation is the gradualShow MoreRelatedThe Use Of Radiation And Its Effects On Living Organisms1333 Words   |  6 PagesResearch Assignment Contemporary Physics Michael A. Torch Dr. David R. Simpson Health Physicist Radiation has been present since the birth of the universe. Upon its discovery in the early 19th century, humans have used radiation for its beneficial purposes that date back decades. However, when used precariously or in large quantities, radiation can be dangerous. 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