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A potential barrier of 0.4V exists acros...

A potential barrier of 0.4V exists across a p-n junction. An electron enters the junction from the n-side with a speed of `6.0 xx 10^(5) ms^(-1)`. The speed with which electron enters th ep side will be `(x)/(3) xx 10^(5) ms^(-1)` the value of x is ____ (Given mass of electron `=9 xx 10^(-31)kg`. charge on electron `=1.6 xx 10^(-19)C`)

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