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B Question about energy-mass relationship

  1. May 26, 2017 #1
    Why the mass of disc does not changes according to Einstein's equation(e=mc^2) when we insert it inside a disc player and it shows us energy in the form of video on a tv/monitor screen.

    • I think there's something wrong in this question, can anybody point out the error with reasoning.
  2. jcsd
  3. May 26, 2017 #2
    The disc does not change, therefore, its mass does not change.
    Can you describe your reasoning in more, smaller steps?
  4. May 26, 2017 #3


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    Can you show the video without the TV and the disc reader being plugged in?
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