How does light interact with the surface of a rough stone?

1 answer:

6 0

The only obvious answer from the information provided would have to be B. because a stone is opaque, when there is an opaque object wit a light shining on it, it does not reflect, it absorbs, so the answer is B.

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We need about 8769 meters of wire to produce a 2.6 kilogauss magnetic field.

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Recall the formula for the magnetic field produced by a solenoid of length L. N turns, and running a current I:

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$B=\mu_0\,\frac{N}{L} \,I\\0.26=4\,\pi\,10^{-7}\frac{N}{0.57} \,3\\N=\frac{0.26*0.57\,10^7}{12\,\pi} \\N=39311.27$

Therefore we need about 39312 turns of wire. Considering that each turn must have a length of $\pi\,D$ , where D is the diameter of the plastic cylindrical tube, then the total length of the wire must be: