(B) Loudness is directly proportional to the square of the amplitude of the wave $(L \propto A^2)$.When the amplitude $(A)$ is doubled $(2A)$, the new

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(B) Loudness is directly proportional to the square of the amplitude of the wave $(L \propto A^2)$.When the amplitude $(A)$ is doubled $(2A)$, the new loudness becomes proportional to $(2A)^2 = 4A^2$.Therefore, the loudness becomes four times the original value.