1. In a party , the sound intensity level is 67dB . When the party is finished , the sound intensity level decreases to 35 dB . How many times is the sound intensity after the party to the during the party ?
2007-01-26 02:37:26 · 4 answers · asked by Choi T 1 in Science & Mathematics ➔ Mathematics
intensity after : intensity during
or in fraction,
intensity after/intensity during = 35dB / 67bD = 0.52
ANSWER: 0.52 times
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2007-01-26 04:03:00 · answer #1 · answered by swas77 2 · 0⤊ 0⤋
1/10^(32/10)
10^(32/10) = 1585 times as loud during the party than after.
1/1585 times as loud after the party than compared to during
2007-01-26 10:56:38 · answer #2 · answered by Brett W 2 · 0⤊ 0⤋
for 5 times decrease in intensity the loudness decreases by 1Db
so if loudness decreases by 32Db then intensity decreases by 160 times.
2007-01-26 10:51:17 · answer #3 · answered by hellboy 1 · 0⤊ 0⤋
You have relative decibels
db = 10 log (I(b)/I(e)) wher I(b) intensity at beginning and I(e) intensity at end
difference of decibels = 67-35 =32
so 32 = 10 log (I(b)/I(e)) and
log (I(b)/I(e)) = 3.2
I(b)/I(e)= 10^3.2 = 1584
2007-01-26 10:48:21 · answer #4 · answered by maussy 7 · 0⤊ 0⤋