Question: Electrons are accelerated through a potential difference of 9.91 kV and pass through a single slit of width 7.10 10 10 m. How wide is

Electrons are accelerated through a potential difference of 9.91 kV and pass through a single slit of width 7.10 10¹⁰ m. How wide is the central maximum on a screen that is 1.95 m from the slit?

i know the answer is 6.77 cm I keep calculating 6.87 cm. I cannot figure out where i'm going wrong. Please demonstrate step by step with explanation

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