wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

An enemy plane is at a distance of 300km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as 3×108m/s.


Open in App
Solution

Step 1: Given data:

Distance between the plane and radar =300km

Speed of the radio waves, v=3×108ms-1

Step 2: Formula used:

Time,t=DistanceDvelocityv

Step 3: Find the time taken by radar to detect the plane

The radio waves, at first, reach the plane. Then they get reflected by the plane and so the reflected radio waves reach the radar again where they get detected. So, radio waves have to travel twice the distance between the plane and the radar.

Distance traveled by radio waves,D=2d

=2×300

=600km

D=600×103m1km=100m

Now,

Time taken, t=DistanceDvelocityv

Substitute the known values

t=600×1033×108t=200×103108

t=2×10-3s

Thus, the time taken by radar to detect the plane is 2×10-3s.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Loudness
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon