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 = <em>81.14 dB</em>
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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.
Answer:
1. Decrease
2. Decrease
3. Stay the same
Explanation:
1. The more predators there are that eat the prey(cricket/frog), the less prey there will be.
2. The more the pollution effects them negatively, the more the population will die off.
3. The decrease of food may kill the population, but the increase of food does not effect the birth rate of the population.
The correct answer is a blackhole.
A blackhole is the only object in which nothing, not even light can escape.
Hope this helps!
30 m/s because that is the form that suppose to be for velocity
Correct answer choice is :
D) In a forward-biased setup, large numbers of charge carriers will be pulled across the junction and result in a large current.
Explanation:
P-n junction diode is the easiest mode of all the semiconductor tools. Despite, diodes act a significant role in many electronic appliances. A p-n junction diode can be utilized to change the alternating current to the direct current. These diodes are applied in power supply accessories. Battery attached across the p-n junction causes the diode forward biased, pushing particles from the n-type to the p-type and starting holes in a different way. Electrons and holes cross the junction and join. Photons are carried off as the electrons and holes recombine.
is the wavelength
and speed of 
(this is the speed of sound in air), therefore its frequency is
