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Find the mass of an electrically charged...

Find the mass of an electrically charged particle movng with a velocity of `3xx 10^(6) ms^(-1)` and having a de Brogue wavelength of 2Å.

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`lamda=h/(mv)` or `m=h/(lamdav)=(6.626xx10^(-34))/(2xx10^(-10)mxx3xx10^(6)ms^(-1))`
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