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Imagine an atom made up of a proton and a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Bohr atom model and consider all possible transitions
\( \mathrm{P} \) of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength \( \lambda \) (given in terms of the Rydberg constant \( \mathrm{R} \) for the hydrogen atom) equal to
W.
(A) \( 9 /(5 \mathrm{R}) \)
(B) \( 36 /(5 \mathrm{R}) \)
(C) \( 18 /(5 \mathrm{R}) \)
(D) \( 4 / \mathrm{R} \)
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