Which of the following properties is absolute and independent of frame of reference?

Which of the following properties is absolute and independent of frame of reference?

The time for a particular kind of subatomic particle to decay
The mass of a particular kind of subatomic particle
The speed of light
The size of Earth
C and D

Answer

Only the speed of the light is absolute and independent of frame of reference. Rest are not. Referred to time dilation and length contraction.

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