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4 November, 20:13

A constant tone is being applied to a speaker. The voltage across the speaker is 5 volts. The voltage across the speaker is increased to 15 volts in order to increase the sound level. What is the decibel gain, rounded to the nearest decibel?

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Answers (2)
  1. 4 November, 22:53
    0
    decibel gain is 10 db

    Explanation:

    given data

    voltage v1 = 5 volts

    voltage v2 = 15 volts

    to find out

    decibel gain

    solution

    we have given that 5 volt voltage that is increase to 15 volts

    so

    we know here decibel gain formula that is

    decibel gain = 20 log (v2/v1) ... 1

    put here value of v1 and v2 in equation 1

    decibel gain = 20 log (15/5)

    decibel gain = 20 log3

    decibel gain = 20 * 0.4771

    decibel gain = 9.54 db = approx 10 db

    so decibel gain is 10 db
  2. 4 November, 23:11
    0
    10 do gain

    Explanation:

    The decibel formula for voltage: db = 20*log (%28%28E1%29%29%2F%28%28E2%29%29)

    :

    E1 = 15 v; E2 = 5v

    :

    db = 20*log (%2815%29%29%2F%285%29%29)

    :

    db = 20*log (3)

    :

    db = 20 *.47712

    :

    9.54 db ~ 10 db gain
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