Q150 / 160 · AP EAMCET 2020 (17 Sep Shift 2) · Physics

Light from a source travels out with a velocity \(c\). If the source moves away from the observer with a velocity \(v\), then the relative velocity of light with respect to observer is

  • Correct answer
    A
    \(\mathrm{C}\)
  • B
    \(c+v\)
  • C
    \(c-v\)
  • D
    \(\sqrt{c^2+v^2}\)

Solution

The speed of light in vacuum is the same for any incrtial reference as \(c\left(3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)\). This is true no matter how fast a light source is moving relative to an observer.

Hence, the correct answer is option: 'A'.

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