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JEE Main 16 March 2021 Shift 2 Solved Paper
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© examsnet.com
Question : 16
Total: 90
Two identical antennas mounted on identical towers are separated from each other by a distance of
45
k
m
. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume, radius of earth is
6400
k
m
.)
[16 Mar 2021 Shift 2]
19.77
m
39.55
m
79.1
m
158.2
m
Validate
Solution:
Given, distance between two antennas,
D
=
45
k
m
Radius of Earth,
R
=
6400
k
m
Height of the receiving antenna,
h
=
?
We know that,
D
=
2
√
2
R
h
⇒
h
=
D
2
8
R
.....(i)
Substituting the given values in Eq. (i), we get
h
=
(
45
)
2
8
×
6400
=
(
45
)
2
8
×
6400
=
39.55
m
© examsnet.com
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