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Science Bowl Question

📅 MIT Science Bowl 2022🎓 HS🔄 Round 13#️⃣ Question 23🌟 BONUS📝 Multiple Choice

Which of the following statements best explains why the Hydra cluster's ionized calcium lines are visible?

W) Limb darkening causes other lines in the visual spectrum to dim
X) The Wilson-Bappu effect causes calcium emission lines to strengthen
Y) Ultraviolet wavelengths are redshifted due to Hydra's distance from the earth
Z) Calcium lines are more easily ionized due to electron instability in the cluster
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