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Naysa150724
23.08.2019 •
Physics
Three noise sources produce volume (loudness) levels of 70, 73, and 80 db when acting separately. when the sources act together, the resultant intensity is the sum of the individual intensities. find the sound volume level in decibels when the three sources act at the same time.
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Ответ:
Sound at 70 dB is 70 dB louder than the human reference level. That's 10⁷ times as much as the reference sound power.
Sound at 73 dB is 73 dB louder than the human reference level. That's 10⁷.³ or 2 x 10⁷ times as much as the reference sound power.
Sound at 80 dB is 80 dB louder than the human reference level. That's 10⁸ or 10 x 10⁷ times as much as the reference sound power.
Now we can adumup:
Intensity of all 3 sources = (10⁷) + (2 x 10⁷) + (10 x 10⁷)
Intensity = (13 x 10⁷) times the sound power reference intensity.
Intensity in dB = 10 log (13 x 10⁷) = 10 (7 + log(13)
Intensity = 70 + 10 log(13)
Intensity = 70 + 10 (1.114)
Intensity = 70 + 11.14
Intensity = 81.14 dB
Looking at the questioner's profile, I seriously wonder whether I'll ever get a comment in return from this creature, and how I'll ever find out if my solution is correct. For that matter, I'm also seriously questioning how and whether my solution will ever be used for anything.
Ответ:
Part a)
Part b)
Explanation:
Part a)
As we know that the diameter of the planet is given as
now the radius of the planet is given as
now we know that the acceleration due to gravity of the planet is given by the equation
here we know that
now from above equation we have
now we have
Part b)
Now by kepler's law we know that
time period of revolution of planet about the star is given as
so we have
now we have
mula of time period
Now we have