C Chandani 🎓 Tutor II ⭐ 10.97K Points 📊 Physics Q. Light travels at the fastest speed in: (A) glass (B) water (C) hydrogen (D) vacuum 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (D) vacuum You must be Logged in to update hint/solution 💬 Discussion 💬 Comment