Discussion
Bulk Modulus for a perfectly rigid body is
Answer: A
The bulk modulus of a perfectly rigid body is Infinite.
Bulk modulus is \(K = -\frac{\Delta P}{\Delta V / V}\), the pressure change divided by the fractional change of volume. A perfectly rigid body does not change its volume at all, so \(\Delta V = 0\) and \(K\) becomes infinite.
Zero bulk modulus would mean the body compresses without resistance, the opposite of rigidity; unity and a finite low value have no special meaning here.
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