Eph = hc/l = (42 -32)h2/8ml2

l = 8ml2c/(42 - 32)h

There are 6 carbon atoms so there are 5 bonds making up l

l = [8(9.1X10-31)(5X0.15X10-9)2(3.00X108)]/[7(6.63X10-34)] =2.65X10-7 m = 265 nm

Answer is E

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