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An electron (9×10^-31 kg, 1.6 ×10^-19 C)...

An electron (`9×10^-31 kg, 1.6 ×10^-19` C) is accelerated by a voltage of 40kv.What is the wavelength? h= `6.6 ×10^-34` SI units.

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-PHYSICS SECTION B
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