Concept explainers
(a)
The estimated sound level for amplifier A and amplifier B.
(a)
Answer to Problem 15P
The estimated sound level for the both cases are
Explanation of Solution
Given:
The power of amplifier A is
The power of amplifier B is
The distance between amplifier and the loudspeaker is
Hearing intensity,
Formula used:
The intensity is given as,
Here,
The intensity level is given as,
Here,
Calculation:
Assume that the sound spreads spherically outward, then the intensity of amplifier is A.
Calculate the intensity level for the Amplifier A.
Similarly, for the case of
And,
Conclusion:
The sound level for the respective cases are,
(b)
To Check: The expensive amplifier sound loud.
(b)
Answer to Problem 15P
No, the expensive amplifier will not sound twice as loud as the cheaper one.
Explanation of Solution
Introduction:
The loudness of the sound is compared on the basis of the intensity of the sound. If the intensity of sound is higher that indicates that amplifier produces a louder sound.
The intensities need to differ by the factor of 10 for a sound to be perceived as twice as loud as another. Therefore, they differ from each other by a factor of
Conclusion:
Hence, the expensive amplifier will not sound loud.
Chapter 12 Solutions
Physics: Principles with Applications
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