R Ram Sharma 🎓 Coach ⭐ 193.88K Points 📊 Physics Q. In which decade was the telegraph invented? (A) 1810s (B) 1890s (C) 1870s (D) 1840s 👁️ Show Answer 🔗 Share ⚡Menu ✅ Correct Answer: (D) 1840s You must be Logged in to update hint/solution 💬 Discussion 💬 Comment