Final answer:
Percussion over a solid organ like the liver typically produces a dull sound, distinguishing it from the resonance, flatness, or hyperresonance heard over different types of tissue or abnormalities.
Step-by-step explanation:
When percussing over a solid organ such as the liver, the expected sound is described as "dullness." This is because the liver is dense and does not contain air, so the sound waves do not resonate as they would in an air-filled structure or cavity.
In comparison, resonance would be expected over a hollow organ like the lungs (when healthy), flatness is heard over very dense areas such as muscle, and hyperresonance might occur in the presence of trapped air, as in cases of pneumothorax.