Q

What is the value and unit of one roentgen (R), expressed in SI unit?

RRB Minis. & Iso., Category (Librarian); RRB NTPC (10+2 level) (Stage-1) RRB Minis. & Iso., Category (Librarian); RRB NTPC (10+2 level) (Stage-1) 2025; 2025
✓ Answer: B 2.58×10^-4 coulomb per kilogram
One roentgen is a conventional unit of radiation exposure. In SI terms, 1 R corresponds to 2.58×10^-4 C/kg of air.