A) \[332m{{s}^{-1}}\]
B) \[379m{{s}^{-1}}\]
C) \[384m{{s}^{-1}}\]
D) \[338m{{s}^{-1}}\]
Correct Answer: C
Solution :
\[\text{v}\,\text{=}\,\text{2f}\,\text{(}{{\text{l}}_{\text{2}}}\text{-}{{\text{l}}_{\text{1}}}\text{)}\] \[\text{v}=2\times 480\times \left( 7030 \right)\times {{10}^{2}}\] \[\text{v}=960\times 40\times {{10}^{2}}\] \[\text{v}=38400\times {{10}^{2}}m/s\] \[\text{v}=384\text{ }m/s\]
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