The magnitude of the de-Broglie wavelength $(\lambda)$ of electron $(e)$,proton $(p)$,neutron $(n)$ and $\alpha-$ particle $(\alpha)$ all having the same energy of $1\,MeV$,in the increasing order will follow the sequence

  • A
    $\lambda_{ e }, \lambda_{ p }, \lambda_{ n }, \lambda_\alpha$
  • B
    $\lambda_{ e }, \lambda_{ n }, \lambda_{ p }, \lambda_\alpha$
  • C
    $\lambda_\alpha, \lambda_{ n }, \lambda_{ p }, \lambda_{ e }$
  • D
    $\lambda_{ p }, \lambda_{ e }, \lambda_\alpha, \lambda_{ n }$

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The de-Broglie wavelength of an electron moving with a velocity of $1.5 \times 10^8 \ m/s$ is equal to that of a photon. What is the ratio of the kinetic energy of the electron to that of the photon? (Given: $c = 3 \times 10^8 \ m/s$)

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