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Question

Two springs, of force constant k1 and k2, are connected to a mass m as shown. The frequency of oscillation of the mass is f. If both k1 and k2 are made four times their original values, the frequency of oscillation becomes
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A
f/2
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B
f/4
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C
4f
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D
2f
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Solution

The correct option is D 2f
This system can be treated as two parallel spring system with spring constants k1 and k2. Now, frequency
f=12πk1+k2m
When both
k1 and k2 are made four times their original value, the new frequency becomes:
f=12π4k1+4k2m
=12π2k1+k2m
=2f

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