Question

The frequency of aradar is 780 MHz. The frequency of reflected , wave from an aeroplane is increased by 2.6KHz. The velocity of the aeroplane is

• A. 2 km/s
• B. 1 km/s
• C. 0.5 km/s
• D. 0.25 km/s

Answer 1

Answer: (C)

$\Delta n=\left(\frac{2V_s}{c}\right)n$