Imagine that you are trying to stop neutrinos with a lead shield. How thick would you need to make this shield to ensure that it can stop a neutrino?
A) about 150 million kilometers (the size of an astronomical unit)
B) about 700,000 kilometers (the radius of the Sun)
C) about one meter
D) about 14 billion light years (the size of the observable universe)
E) about one light year
Correct Answer:
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