A) 0.25 km/s
B) 0.5 km/s
C) 1.0 km/s
D) 2 km/s
Correct Answer: B
Solution :
The velocity of aero plane \[v=\frac{1}{2}\frac{\Delta nc}{n}\] Given, \[\Delta n=2.6\text{ }kHz=2.6\times {{10}^{3}}Hz,\] \[c=3\times {{10}^{8}}m/s,\] \[n=780\text{ }MHz=780\times {{10}^{6}}Hz\] \[v=\frac{1}{2}\frac{2.6\times {{10}^{3}}\times 3\times {{10}^{8}}}{780\times {{10}^{6}}}\] \[v=0.5\times {{10}^{3}}m/s\] \[v=0.5km/s\]
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