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Two springs of force constants 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
b
f/4
c
4f
d
2f

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detailed solution

Correct option is D

f=12πk1+k2m and f'=12π2k1+k2m=2f

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