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Calculate the de Broglie wavelength of a...

Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to `81.9 xx 10^(-15) J`. (Given `:` mass of proton is 1836 times that of electron ) .

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de-Broglie wavelemgth of proton ,`lambda=h/(sqrt(2mK))``{(m_p=1.67xx10^(-27)kg),(K.E=81.9xx10^(-15)J):}`
`=(6.6xx10^(-34))/(sqrt(2xx1.67xx10^(-27)xx81.9xx10^(-15)))=(6.6xx10^(-34))/(1.6539xx10^(-20))=3.99xx10^(-14)`
`lambda=4xx10^(-14)m`
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