1.

We know that speed of light in vacuum is always constant and equal to c = 3 xx 10^(8) m//s. There is a source of light and speed of light emitted from the source is to be measured. Three different frames of refernce, namely P, Q and R, are used in the experiment. Frame of reference P is moving towards the source and R is moving away from the source with same speed. Frame of reference Q is fixed at its location. V_p, V_Q and V_R are the speeds of light as measured by the observers in corresponding reference frames. Answer the following question : Select correct option(s) if surrounding space is vacuum everywhere

Answer»

`V_P gt V_Q gt V_R`
`V_P lt V_Q lt V_R`
`V_P = V_Q = V_R`
`V_Q = (V_P + V_R)/(2)`

Solution :Concepts of relative motion are not valid for light in vacuum and speed of light remains constant irrespective to the state of observer. HENCE option (C ) is CORRECT. If option (c ) is correct then we can easily UNDERSTAND that option (d) is also correct.


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