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[" 31.An electron accelerates through a ...

[" 31.An electron accelerates through a potential difference "],[" of "4.9" V collides with a mercury atom and transfers "],[" it to first excited state.The wavelength of a photon "],[" corresponding to the transition of mercury atom to "],[" its ground state is about "],[" (1) "2050A],[" (2) "2240A],[" (4) "2530A],[" (4) "2935A]

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