Question

A radar is sending out pules of 1 micro second duration at interval of 100 micro-second. The range of the radar is

Options

• 15 cm

• 15 metre

• 15 km

• 150 km

Answer 1

15 km

Explanation:

The time interval between the pulses leaving and returning is t = 100 × 10^-6 second.

The total distance travelled by the pluses is = d + d = 2d.

d = v +/2 = 3 × 10₈ × 100 × 10^-6/2

= 15 × 10^m

= 15 km.