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Science Bowl Question

📅 NSB MS 2017🎓 MS🔄 Round 1#️⃣ Question 8❓ Toss-up📝 Multiple Choice

The length of a meter was re-defined in 1983 to be based on what physical quantity?

W) A wavelength of krypton-86 radiation
X) The distance light travels in a specific fraction of a second in a vacuum
Y) The length of a one-kilogram bar of iridium
Z) A specific fraction of the length of the meridian through Paris from the North Pole to the Equator
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