A) 25
B) 0.25
C) \[0.25\times {{10}^{4}}\]
D) \[25\times {{10}^{4}}\]
Correct Answer: C
Solution :
Number of waves \[=\frac{{{10}^{-3}}}{4000\times {{10}^{-10}}}=0.25\times {{10}^{4}}\]
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