A) 340 m/s
B) 170 m/s
C) 85 m/s
D) 42.5 m/s
Correct Answer: C
Solution :
\[\frac{n'}{n''}\,\,=\,\,\frac{V+{{V}_{S}}}{V-{{V}_{S}}}\,\,=\,\,\frac{5}{3}\] \[3V+3{{V}_{S}}=5V\,\,-\,\,5{{V}_{S}}\] \[{{V}_{S}}\,\,=\,\,\frac{V}{4}\,\,=\,\,\frac{340}{4}\,\,=\,\,85\,\,m/s\]You need to login to perform this action.
You will be redirected in
3 sec