Attenuation of wave due to absorption, and the equation for exponential decrease of intensity!

00:00 Attenuation due to Absorption by Media
00:25 Attenuation - decrease in intensity/power/amplitude
03:07 Exponential decrease in intensity
05:58 Attenuation equation & absorption coefficient
09:37 Equation for Parallel breams
10:46 Fraction of reflected intensity (coefficient)
11:30 BONUS: Multi-layer attenuation and reflection

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Practice Past Year Questions
*starred Q's are in example videos
ON14 P43 Q11 (pg5) Ultrasound, Muscle & Bone reflection*
MJ16 P43 Q4 (pg7) Ratio of ultrasound & reflection
MJ11 P41 Q10 (pg9) Intensity reflection coefficient
MJ19 P42 Q4 (pg10) Relative magnitudes of Z values
ON19 P42 Q5 (pg11) double layer fraction*
MJ20 P41 Q4 (pg14) Attenuation coefficient*

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