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    Physics-
    General
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    Question

    The energy of a photon of light with wavelength 5000 text Å end text is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1text  Å  end textwould be

    1. 2.5/5000 eV    
    2. 2.5 divided by left parenthesis 5000 right parenthesis to the power of 2 end exponent e V    
    3. 2.5 cross times 5000   e V    
    4. 2.5 cross times left parenthesis 5000 right parenthesis to the power of 2 end exponent e V    

    The correct answer is: 2.5 cross times 5000   e V

      E proportional to fraction numerator 1 over denominator lambda end fraction rightwards double arrow fraction numerator 2.5 over denominator E ´ end fraction equals fraction numerator 1 over denominator 5000 end fraction rightwards double arrow E ´ equals left parenthesis 2.5 right parenthesis cross times 5000   e V

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