行星科学概论4吴昊.ppt.pdf

: : Stationary Moving : : v velocity shifted wavelength − rest wavelength = speed of light rest wavelength v λ − λ 1 0 = c λ 0 •  6562.85 Å, 6562.55 Å λ1 − λ0 v = λ × c 0 v = (6562.55 − 6562.85) × 10−8 cm × 3 × 1010 cm = −1.37 × 106 cm = −13.7 km toward us −8 6562.85 × 10 cm sec sec sec (beat) vc •  . a)  b)  c)  d)  e)  •