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natali 33 [55]
3 years ago
10

Can I have help please? Ill need you to explain the answer, so ill put double the points, please dont scam me, i just want to do

my work. thank you :)

Physics
1 answer:
ivanzaharov [21]3 years ago
3 0
Mechanical waves<span> require an initial </span>energy<span> force. Once this </span>energy<span> is added, the </span>wave<span> travels through the medium until all its </span>energy<span> is </span>transferred<span>. In contrast, electromagnetic </span>waves<span> require no medium, but can still travel through one.</span>
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D=2.996\times 10^{-2} m

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Given the electric strength as  1.0\times 10^5 N/C.  transferring 3.9\times 10^9 electrons, the disk's Area can be calculated using the formula:

E=\frac{\eta}{\epsilon_o}=\frac{Q}{A\epsilon_o}\\\\A=\frac{Q}{E\epsilon_o}\\\\=\frac{(3.9\times 10^9)\times (1.6\times10^{-19})}{(1.0\times 10^5 )\times (8.85\times10^{-12})}\\\\A=7.0508\times 10^{-4} \ m^2

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A=\pi(D/2)^2\\\\2\sqrt{\frac{A}{\pi}}=D\\\\=2\sqrt{7.0508\times 10^{-4}/\pi}\\\\D=2.996\times 10^{-2} \ m

Hence, the diameter of the disks is D=2.996\times 10^{-2} m

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