[单选题]
Estimate the observed wav-yrjq r) ;dtve/h d7h;elength for the 656 nm line in the spdgzev a. yrbym1j/2yk 2r87i9ectrum of a star which is 100 million r 8v/yb79i yag.k1yd rmj 22ezlight-years from us.
A. $653 \; nm$
B. $656 \; nm$
C. $659 \; nm$
D. $692 \; nm$
Post time 2024-1-22 00:41:59