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2015-08-20T14:00:57+05:30

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 λ =  h / p = De Broglie wavelength of a massive particle travelling at a momentum of p.

λ = 0.0005 * 10⁻⁴° meters ??? is some thing missing in the question ?
   =>  p = 6.626 * 10⁻³⁴ J-sec / 0.0005 * 10⁻⁴° meter = 1.3252 * 10¹°  kg-m/sec 
   => mass = p / m = 6.6626 * 10⁷ kg
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Perhaps  λ =  0.0005 * h 
in that case,

   p = h / λ = 2000 kg-m/sec
   then  mass m = 2000 kg-m/sec  / 200 m/sec    = 10 kg

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