Question: At what redshift will the Lyman alpha line be the same as the un-redshifted value of the H alpha line (Lambda = 6564 A)? How

At what redshift will the Lyman alpha line be the same as the un-redshifted value of the H alpha line (Lambda = 6564 A)? How would you be able to tell the difference between observing the H alpha line or a redshifted Lyman alpha line

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