You are standing in the middle of a large room listening to a cacaphony of sound

Question

You are standing in the middle of a large room listening to a cacaphony of sounds. Rank the intensity of the sounds from each source (1-loudest, 2- next loudest, ...) Consider all objects to be right next to you. If two values are within 0.1 dB from each other, consider them to be the same. 1 An object emitting a sound with an intensity of 1.0×10-5 w/m2 2An object emitting a sound with an intensity level of 100 dB. 3 Two buzzers each producing a sound with intensity level of 90 dB. An object emitting a sound with an intensity level of 20dB. Consider converting everything into decibels (intensity level). Submit Answer Incorrect. Tries 1/10 Previous Tries

Explanation / Answer

Loudest: An object emitting a sound with an intensity level of 100 dB.

Two buzzers each producing a sound with intensity level of 90 dB = 93 dB.
[The combined source is 2 times as intense as a single buzzer. 10*log(2) = 3dB, so we add 3dB to 90dB giving 93 dB total ]

An object emitting a sound with an intensity of 1.0×10^-5 W/m² 70 dB.
[db = 10*log(I/Io) . ; Io = 10^-12 W/m^2]
[10*log(10^-5 / 10^-12) = 10*log(10^7) = 10*7 = 70 dB]

Quietest: An object emitting a sound with sound intensity level of 20 dB.

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.