A sodium vapor lamp (λ ~ 6 ´ 10-7 m) radiates 100 w of output uniformly in all directions. At what distance from the lamp will the photons have an average density of 106 m-3 ?.

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When does your body conduct current more readily?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?