Interaction Of Sound And Media Jeopardy Template

Refraction	Incidence	Attenuation	Decibels	Etc
10 Refraction. What is the change in direction of wave propagation when traveling from one medium to another called?	10 False. Orthogonal, perpendicular, and right angle describe 90 degrees normal incidence. T or F. Orthogonal is another term used to describe oblique incidence.	10 Increases As the path length increases, the attenuation of ultrasound in soft tissue ____	10 Double For every 3dB change, the intensity will do what?	10 4 What is the log of 10,000?
20 Transmission Refraction is known as ____ with a bend.	20 50 w/cm^2 since it is totally reflected. A sound wave with an intensity of 50 w/cm^2 strikes a boundary and is totally reflected. What is the reflected intensity?	20 False. Attenuation in air is greater. T or F: Attenuation in air is less than attenuation in soft tissue.	20 -3dB What was the decibel change if the intensity of a sound beam was reduced one-half?	20 Incident Reflected Angle = _____ Angle
30 False. The transmission angle will be LESS than the incident if Medium 2 is less than medium 1. The transmission angle will be more than the incident angle when the speed of Medium 2 is less than the speed of Medium 1. True or False?	30 Refraction If there is an oblique incidence between two different propagation speeds of two media, what will occur?	30 Increases What happens to the depth of penetration if frequency were to decrease?	30 Start level (reference) and end level (actual) Decibels require what 2 intensities?	30 Half the frequency What is the attenuation coefficient equal to?
40 The transmission angle is greater than the incident angle. What does Speed 2 greater than Speed 1 mean?	40 100%. Remember the Energy Conservation Law, and coefficients are measured in % not w/cm^2. A sound wave with an intensity of 50 w/cm^2 strikes a boundary and is totally reflected. What is the intensity reflection coefficient?	40 False. Attenuation and propagation speed are unrelated. Attenuation will increase with the speed of sound; true or false?	40 Logarithmic Fill in the blank: Decibel notation is ______.	40 True. Structures that do not attenuate much have a thick half-value layer thickness. True or False?
50 1. Oblique Incidence 2. Different propagation speeds What two criteria are required for refraction to occur?	50 0%, remember refraction cannot occur with normal incidence. A sound wave strikes a boundary of identical medias at a normal incidence. Will 100%, 75%, 0%, 25%, 1%, or 90% of the beam be refracted?	50 Absorption, reflection, and scattering What three processes contribute to attenuation?	50 Positive If the initial intensity of a sound beam is less than the final intensity, then the gain in dB is ___?	50 Thin. What half-value layer thickness does a high frequency have?

Interaction of Sound and Media

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