At what frequency and wavelength was this observation made

Radio astronomers have detected a transition from n = 253 to n = 252 due to highly excited Hatoms.a) At what frequency and wavelength was this observation made?b) The average value of the distance of the electron from the nucleus can be solved for all values of n and l _nl=n^2 a_0 (1+1/2[1-l(l+1)/n^2]) Assume the emitting atom is in a p-state and calculate the average value of the distance of the electron from the nucleus.

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