Câu hỏi 29

Theo bài ra ta có

\(\begin{array}{l}\overline v  = \lambda f = 75.440 = 33000cm/s = 330m/s\\\Delta v = \overline v \left( {\frac{{\Delta f}}{f} + \frac{{\Delta \lambda }}{\lambda }} \right) = 330\left( {\frac{{10}}{{440}} + \frac{1}{{75}}} \right) = 11,9cm/s\end{array}\)