A voltmeter has a range of [4V, 20 V] and a resolution of 1 mV. The dynamic range is

24 dB

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60 dB

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72 dB

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84 dB

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Solution

The correct option is D 84 dB
Dynamic range,
$= \frac{20 - 4}{1 m V} = 16000$

$D y n a m i c r a n g e (d B) = 20 l o g_{10} 16000 = 84 d B$

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