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Proton and alpha particle with given de Broglie wavelengths: ratio of their velocities

The same question, asked 2 times: 2021 Paper 2*, 1 Feb 2024. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 2

    16
    The de Broglie wavelength of a proton and α\alpha-particle are equal. The ratio of their velocities is:

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  2. Question 2

    1 Feb 2024

    11
    The de Broglie wavelengths of a proton and an α\alpha particle are λ\lambda and 2λ2\lambda respectively. The ratio of the velocities of proton and α\alpha particle will be:

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