A hydrogen atom initially in the ground level P absorbs a photon an...

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A hydrogen atom initially in the ground level
P absorbs a photon and is excited to \( n=4 \) level then

W the wavelength of photon is
(a) \( 790 \AA \)
(b) \( 870 \AA \)
(c) \( 970 \AA \)
(d) \( 1070 \AA \)
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