How many decibels of attenuation correspond to an ultrasonic signal loss of from 100% to 25% on full screen height?

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Q. How many decibels of attenuation correspond to an ultrasonic signal loss of from 100% to 25% on full screen height?

(A) 6
(B) 10
(C) 12
(D) 14

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✅ Correct Answer: (C) 12

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