An electron travelling with a speed of 5...

An electron travelling with a speed of `5 xx 10^3`m/s passes through an electric field with an acceleration of `10^12 ms^-2`. How long will it take for electron to double its speed?

`0.5 xx 10^-9`s

`0.5 xx 10^1-10`s

`5 xx 10^-9`s

`5 xx 10^-12`s

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