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    A rocket moving with speed v relative to the ground emits a flash of light in the backward direction. An observer in the rocket measures the speed of the flash of light to be c.

    Question
    HLPaper 2

    A rocket moving with speed v relative to the ground emits a flash of light in the backward direction. An observer in the rocket measures the speed of the flash of light to be c.

    1.

    State the speed of the flash of light according to an observer on the ground using Galilean relativity.

    [1]
    Verified
    Solution

    c−vc-v c−v 1 mark

    2.

    State the speed of the flash of light according to an observer on the ground using Maxwell's theory of electromagnetism.

    [1]
    Verified
    Solution

    cc c 1 mark

    3.

    State the speed of the flash of light according to an observer on the ground using Einstein's theory of relativity.

    [1]
    Verified
    Solution

    cc c 1 mark

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