Both questions needed. Full working needed and all formulas used. A justificatio

Question

Both questions needed. Full working needed and all formulas used. A justification is needed of why that is the right answer. Will give thumbs up for correct answers. 5. In addition to describing the propagation of light waves, Snell's law also describes the passage of sound waves from one medium to another. Acoustic impedance is equal to the speed of sound times the density of the medium. One uses Snell's law to derive a relationship between the angles of incidence and refraction and the acoustic impedance of the materials using the speed of sound. If sound travels from muscle (medium 1) to liver (medium 2) at an angle of 30°(91) in the schematic below, calculate the angle of penetration into liver (92). Note that the acoustic impedance of muscle is 1.7 Rayls and the acoustic impedance of liver is 1.65 Rayls. 0, 2 6. If a gamma detector measures gamma photons for 2 seconds and yields a signal to noise ratio of 20, what is the number of gamma photons detected per second from a radioactive sample governed by a Poisson distribution?

Explanation / Answer

According to Snell's law

n1 sin (theta 1) = n2 sin (theta 2)

1.7 sin30 = 1.65 sin (theta 2)

Sin (theta 2) = 0.515

Theta 2 = arcsin 0.515 = 31 degree

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