railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

অবলোহিত-লাল তরঙ্গের তরঙ্গদৈর্ঘ্যের পরিসীমা কত?

1
1 nm থেকে 10 -3 mm 
2
400 nm থেকে 1 mm 
3
700 nm এবং 1 mm 
4
0.1 m থেকে 1 mm 
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