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In an amplifier, the power output is 2 W at 5 kHz and 0.5 W at 50 Hz. If the input power is constant at

In an amplifier, the power output is 2 W at 5 kHz and 0.5 W at 50 Hz. If the input power is constant at 10 mW, what is the variation (approximate) of power gain in dB at two frequencies? (log₁₀2 ≈ 0.30)

A. 7dB

B. 6dB

C. 7.5dB

D. 3.5dB

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