Answers: 3
 
![v = c * [\frac{\Delta \lambda}{\lambda} ]](/tpl/images/0835/1292/32d37.png)
![v = 3.0*10^{8} * [\frac{ 3.2*10^{-9}{830 *10^{-9}} ]](/tpl/images/0835/1292/74ded.png)
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