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ICSE Class 10 Physics 2017 Solved Paper

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Question : 14
Total: 65
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 radiowaves at 3×108ms−1.
Solution:  
Given : d=300‌km=300×103m,V=3×108 ms−1.

We know, V‌=‌
2d
t
∴ t‌=‌
2d
v
=‌
2×300×103
3×108
‌=2×10−3 sec.
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