Question
Write SI units for the fundamental quantity.
| Basic Quantity | Unit |
| Length | metre |
| Mass | kilogram |
| Time | second |
| Electric current | ampere |
| Temperature | kelvìn |
| Amount of substance | mole |
| Luminous intensity | candela |
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When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
| Group in the modern periodic table | Families |
| a) 1 | ? |
| b) ? | Transition metals |
| c) ? | Boron family |
| d) 15 | ? |
| e) 17 | ? |