I don't agree with either of your numbers
d =(6/pi)(2*10^-3)/(3*10^8)= 1.27*10^-11
Could someone work this out for me? Someone says the answer is 2.34 x 10^-6 but I think it's 2.34 x 10^-4.
2 x 10^-3 = 3 x 10^8 x 1/6 x pi x d
Solving for d. Sorry it's kinda messy.
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