The astrophysicist should look for the wavelength of 1.094 * 10^-6 m
Using the Rydberg equation
1/λ = R(1/nf^2 - 1/ni^2)
ni = 6, nf = 3
Where R is the Rydberg constant, 1.097 * 10^7 m^-1
1/λ = 1.097 * 10^7 (1/9 - 1/36)
1/λ = 1.097 * 10^7 (0.1111 - 0.0278)
1/λ = 1.097 * 10^7 (0.0833)
1/λ = 913801 m^-1
λ = 1.094 * 10^-6 m
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