A) \[3\times {{10}^{13}}cm\]
B) \[3\times {{10}^{7}}cm\]
C) \[3000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[300\text{ }nm\]
Correct Answer: B
Solution :
\[c=v\lambda \] \[\lambda =\frac{c}{v}\] \[=\frac{3\times {{10}^{8}}}{1000}=3\times {{10}^{5}}m\] \[=3\times {{10}^{7}}cm\]
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