A potential barrier of 0.4 V exists across a p-n junction. An electron enters the junction from the n-side with a speed of $6.0 \times 10^5 \mathrm{~ms}^{-1}$. The speed with which electron enters the $p$ side will be $\frac{x}{3} \times 10^5 \mathrm{~ms}^{-1}$ the value of $x$ is_______.
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