XAT 2013 Question 13
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XAT
Fermi determined the lower limit of the yield using the confetti.
"As the wind from the initial blast wave began to blow through the camp, he slowly dribbled the confetti into the air, observing how far back it was scattered by the blast (taking the farthest scattered pieces as being the peak of the pressure wave). Fermi concluded that the yield must be greater than 10 kilotons."
Only option A uses a parallel reasoning. Options B, C, and D try to determine the average and exact values. Therefore, option A is the right answer.