Problem (2) Doppler shift ES 281 9/15 /22 O Earth Preceding a ) A far away star ( with much hydrogen ) emits Hy radiation ( transition from n 3 to 1= 2 of H ) at rest with respect to the star An = 656. 3 nm ( which is red light) receding 0. 07 a ( speed of star relative to Earth ) calculate the wavelength of the Hey radiation arriving at the Earth. ( It is much easier to measure wavelengths than light frequencies . Remember L. f = ( ) . b) Same as above but for a closer star (~ 100 million light years NS 10" light years) where Nreceding Is the wavelength resolution of the measurement is A1 = Olum, is the Doppler shift measureable