A) \[\frac{{{n}_{1}}}{2}\]
B) \[2n\]
C) \[\frac{3{{n}_{1}}}{2}\]
D) \[\frac{2{{n}_{1}}}{3}\]
Correct Answer: C
Solution :
| [c] Total time taken to travel distance d is: |
| \[\frac{d}{2{{n}_{1}}}+\frac{d}{2{{n}_{2}}}=d\left( \frac{{{n}_{1}}+{{n}_{2}}}{2{{n}_{1}}{{n}_{2}}} \right)=\frac{d}{{{n}_{eff}}};\] |
| \[{{n}_{2}}=3{{n}_{1}}\Rightarrow \,{{n}_{eff}}=\frac{3}{2}{{n}_{1}}\] |
| \[=\frac{6\times {{10}^{5}}cm}{1.0003-1}\]\[=0.2cm=2mm\] |
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