The height of the antenna is 98 m. The radius of Earth is 6400 km. The area up to which it will transmit signal is:
Show Hint
For line-of-sight calculations, use the approximate formula d = √2Rh.
- 3642 km2
- 3942 km2
- 11200 km2
- 22400 km2
The Correct Option is B
Approach Solution - 1
Step 1: Use the formula for surface area covered.- Maximum distance covered d = $\sqrt{2RhT}$.- Surface area A = πd2 ≈ 2πRhT.
Step 2: Substitute the values.
A=2πRhT
A = 2 · 3.14 · 6400 · 98 · 10-3.
A ≈ 3942 km2.
Final Answer: Surface area covered = 3942km2.
Approach Solution -2
\(r = \sqrt{2Rh}\)
Area \(= \Pi r^{2} = 2\Pi Rh\)
\(= 2 \times \frac{22}{7} \times 6400 \times 103 \times 98\)
\(= 3942.4 \times 106m^{2}\)
\(= 3942.4 km^{2}\)
Top Questions on communication systems
- In amplitude modulation, the modulation index should be:
- GATE IN - 2026
- Instrumentation Engineering
- communication systems
Identify the correct truth table of the given logic circuit.
- JEE Main - 2026
- Physics
- communication systems
Find the correct combination of A, B, C and D inputs which can cause the LED to glow.
- JEE Main - 2026
- Physics
- communication systems
Select correct truth table.
- JEE Main - 2026
- Physics
- communication systems
- Theorem/law and its corresponding specified quality are given in the table below. Match List-I with List-II
- CUET (PG) - 2025
- Electronics Engineering
- communication systems
Questions Asked in JEE Main exam
- In a microscope of tube length $10\,\text{cm}$ two convex lenses are arranged with focal lengths $2\,\text{cm}$ and $5\,\text{cm}$. Total magnification obtained with this system for normal adjustment is $(5)^k$. The value of $k$ is ___.
- JEE Main - 2026
- Optical Instruments
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
- JEE Main - 2026
- Organic Chemistry
- Let \( ABC \) be an equilateral triangle with orthocenter at the origin and the side \( BC \) lying on the line \( x+2\sqrt{2}\,y=4 \). If the coordinates of the vertex \( A \) are \( (\alpha,\beta) \), then the greatest integer less than or equal to \( |\alpha+\sqrt{2}\beta| \) is:
- JEE Main - 2026
- Coordinate Geometry
- Three charges $+2q$, $+3q$ and $-4q$ are situated at $(0,-3a)$, $(2a,0)$ and $(-2a,0)$ respectively in the $x$-$y$ plane. The resultant dipole moment about origin is ___.
- JEE Main - 2026
- Electromagnetic waves
Let \( \alpha = \dfrac{-1 + i\sqrt{3}}{2} \) and \( \beta = \dfrac{-1 - i\sqrt{3}}{2} \), where \( i = \sqrt{-1} \). If
\[ (7 - 7\alpha + 9\beta)^{20} + (9 + 7\alpha - 7\beta)^{20} + (-7 + 9\alpha + 7\beta)^{20} + (14 + 7\alpha + 7\beta)^{20} = m^{10}, \] then the value of \( m \) is ___________.- JEE Main - 2026
- Complex Numbers and Quadratic Equations
Concepts Used:
Communication Systems
A system that describes the information exchange between two points is called the communication system. The transmission and reception process of information is called communication. The major elements of communication are such as:
- The Transmitter of information
- Channel or medium of communication
- The Receiver of information
Examples Of Communication Systems:
The following are the examples of communication systems:
- Internet
- Public Switched Telephone network
- Intranet and Extranet
- Television
Types Of Communication Systems:
Turning on Signal specification or technology, the communication system is categorized as follows:
- Analog technology communicates data as electronic signals of differing frequencies or amplitude. For instance Broadcast and telephone transmission.
- In Digital technology, the data are created and processed in two states: High (represented as 1) and Low (represented as 0). Also this technology stores and transmits data in the form of 1's and 0's.
Elements of a Communication System:
