Physics, 21.06.2021 20:30 lzrd3rik

At a rock concert, the sound intensity 1.0m in front of the bank of loudspeakers is 0.10 W/m^2. A fan is 30.0m from the loudspeakers. Her eardrums have a diameter of 8.4mm. How much energy is transferred to each eardrum in one second?

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Answer from: qudoniselmore0

The amount of energy transferred to each eardrum in one second is $6.2 \times 10^{-9} J$ .

Explanation:

Given: Intensity = 0.10 $W/m^{2}$

Now, at 30.0 m the intensity will be calculated as follows.

$Intensity = \frac{(30.0 m)^{2}}{(1 m)^{2}}\\= 900$

This means that the intensity is 900 times less assuming that the wave is spherical.

Hence, the new intensity is calculated as follows.

$\frac{0.10 W/m^{2}}{900}\\= 1.11 \times 10^{-4} W/m^{2}$

The area of ear drum is expressed as follows.

$Area = \pi \times r^{2}\\= 3.14 \times (4.2 mm)^{2}\\= 5.54 \times 10^{-5} m^{2}\\$

Formula used to calculate energy is as follows.

$P = I \times a$

where,

P = power or energy

I = intensity

a = area

Substitute the values into above formula as follows.

$P = I \times a\\= 1.11 \times 10^{-4} W/m^{2} \times 5.54 \times 10^{-5} m^{2}\\= 6.2 \times 10^{-9} W$

Thus, we can conclude that amount of energy transferred to each eardrum in one second is $6.2 \times 10^{-9} J$ .

Answer from: Quest

what is the question?

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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