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De broglie Multiple choice AQA help needed.

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Answer is B, don't know how. Can someone please break it down
De Broglie wavelength is equal to h / mv. When Kinetic Energy increases by a factor of 4, you have the velocity increasing by 2 as SQRT(KE) is proportional to V. So this means that h/mv goes to h/2mv, hence halving the DB wavelength.

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