### Which measurement made by two observers yield same results

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Q. Consider two inertial reference frames. when an observer in each frame measures the following quantities, which measurement made by two observers must yield the same results?
1. the distance between two events
2. the value of the mass of a proton
3. the speed of light
4. the time interval between two events
5. newton's first law
6. the order of elements in the periodic table
7. the value of the electron charge

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