Q 1115567469.     Two springs, of force constants `k_1` and `k_2`, are connected to a mass m as shown. The frequency of oscillation of the mass is `f`. If both `k_1` and `k_2` are made four times their original values, the frequency of oscillation becomes

JEE 2007
A

`f/2`

B

`f/4`

C

`4f`

D

`2f`

HINT

`k_(equi)=k_1+k_2` `f=1/(2pi)sqrt((k_1+k_2)/m)`
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