f = 1 / 4 * Π * 
The resonant frequency becomes half.
In resonance,
=
-------- (1)
Where,
,
are the inductive and capacitive reactance of the RLC AC circuit.
We know that,
= 2 * Π * f * L
= 1 / 2 * Π * f * C
Where f is the frequency.
substituting the values of inductive and capacitive reactance in equation (1).
2 * Π * f * L = 1 / 2 * Π * f * C
On solving we get
= 1 / 4 * Π * Π * L * C
Therefore, f = 1 / 2 * Π * 
As values of L and C are doubled.
L = 2 * L
C = 2 * C
f = 1 / 2 * Π * 
f = 1 / 4 * Π * 
Hence, the resonant frequency becomes half.
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