The degree of percussion tone is determined by the density of the medium through which the sound waves travel. Which statement is true regarding the relationship between density of the medium and percussion tone?
a. The more dense the medium, the louder is the percussion tone.
b. The less dense the medium, the louder is the percussion tone.
c. The more hollow the area percussed, the quieter is the percussion tone.
d. Percussion over muscle areas produces the loudest percussion tones.
B
Percussion sounds vary according to the tissue being percussed. Less dense tissue (such as that over normal lungs) produces a loud tone, whereas more dense tissue (such as a muscle) produces a softer tone. The more dense the medium, the softer is the percussion tone. The more hollow the area, the louder is the percussion tone. Percussion tones over muscle are soft and flat.
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