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in pl spectrum what is the red shift and blue shift and also give the interpretaion

  • physics -

    I do not know what you mean by a "pl" spectrum

    A red shift occurs when the observer and the object are moving apart. Wavelengths of spectroscopic features, such as atomic lines, are shifted to longer values when this happens.

    A blue shift occurs if an observed object and the observer are moving towards each other.

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