1.

When electron with mass m is accelerated with volt V associated de-Broglie wavelength is lambda .When proton with mass M is accelerated with same voltage associated de-Broglie wavelength will be………

Answer»

<P>`LAMBDA((m)/(M))`
`lambda((M)/(m))`
`lambdasqrt((m)/(M))`
`lambdasqrt((M)/(m))`

SOLUTION :de-Broglie wavelength `lambda =(h)/(sqrt(2mVq))`
`therefore lambda prop (1)/(sqrt(M))`[`because` Remaining TERMS are same]
`therefore (lambda_(p))/(lambda_(e))=sqrt((m_(e))/(m_(p)))=sqrt((m)/(M))`
`therefore lambda_(p)=lambda sqrt((m)/(M)) [because lambda_(e)=lambda]`


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