A simple spring-mass vibrating system has a natural frequency of $${{\text{f}}_{\text{n}}}.$$ If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
A. $$\frac{{{{\text{f}}_{\text{n}}}}}{2}$$
B. $$2{{\text{f}}_{\text{n}}}$$
C. $$4{{\text{f}}_{\text{n}}}$$
D. $$8{{\text{f}}_{\text{n}}}$$
Answer: Option A
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