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11 thoughts on “Doppler s effect source and observer part1 Urdu Hindi by Dr Hadi
  1. sir yai to physics hai ap to bio kai teacher hai plz koi yai confusion khatam kary..??🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔

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