EASY
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A sample of hydrogen gas in its ground state is irradiated with photons of energies. The radiation form the above sample is used to irradiate two other samples of excited ionized and excited ionized , respectively. Both the ionized samples absorb the incident radiation.
Which is the smallest wavelength that will be observed in spectra of ion?
(a)
(b)
(c)
(d)

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Consider third orbit of (helium), using non-relativistic approach, the speed of electron in this orbit will be given constant , and (Planck's Constant)

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The magnitude of acceleration of the electron in the orbit of hydrogen atom is and that of singly ionised helium atom is . The ratio is,

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