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Science Bowl Question

📅 NSB Round Robin 2020🎓 HS🔄 Round 1#️⃣ Question 23❓ TOSS-UP📝 Multiple Choice

Which of the following physical quantities is least precisely known?

W) The number of hyperfine transitions of cesium-133 in one second
X) The value of the gravitational constant
Y) The value of Planck's constant
Z) The number of meters light will travel in one second
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