Here all the following substances are not pure substances
Usad fact copper and sulfur and silicon insulator
1 mole = 6.22 x 10^23 molecules (Avogadro's number)
15 moles x (6.22 x 10^23) = 9.33 x 10^24 atoms
It passes through by the velocity giving the wave power
Answer:
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Explanation:
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