Basics of Communication
Telangana Open School (TOSS) · Class 12 · Physics
Flashcards for Basics of Communication — Telangana Open School (TOSS) Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What are the three essential components of a communication system?
Answer
The three essential components are: 1. **Transmitter** – converts the message signal into a form suitable for transmission. 2. **Communication Channel** – the medium (like air or cable) through which …
Define analog and digital signals with examples.
Answer
**Analog Signal**: A continuous signal that varies smoothly over time. Example: Human voice in air. **Digital Signal**: A discrete signal that takes only specific values (0 and 1). Example: Data stor…
What is noise in a communication system?
Answer
**Noise** refers to unwanted signals that interfere with the transmitted signal during communication. It can come from external sources (like electrical appliances) or internal components (like amplif…
What is attenuation? How is it overcome?
Answer
**Attenuation** is the loss of signal strength as it travels through a medium. It is overcome by using **amplifiers** at regular intervals to boost the signal strength during transmission.
What is the optimum size of an antenna for a signal of frequency 30 MHz?
Answer
The optimum size of an antenna is at least λ/4, where λ is the wavelength. Given: f = 30 MHz = 30 × 10⁶ Hz Speed of light, c = 3 × 10⁸ m/s Step 1: λ = c / f = (3 × 10⁸) / (30 × 10⁶) = 10 m Step 2: A…
Calculate the wavelength of a radio wave of frequency 98.6 MHz.
Answer
Given: f = 98.6 MHz = 98.6 × 10⁶ Hz Speed of light, c = 3 × 10⁸ m/s Formula: λ = c / f Step 1: λ = (3 × 10⁸) / (98.6 × 10⁶) Step 2: λ = 300 / 98.6 ≈ 3.04 m Answer: 3.04 meters…
Why are high-frequency carrier waves used for long-distance communication?
Answer
Low-frequency signals require very large antennas (comparable to wavelength) and suffer high attenuation. High-frequency carrier waves have shorter wavelengths, allowing practical antenna sizes. They …
What is modulation? Why is it necessary?
Answer
**Modulation** is the process of superimposing a low-frequency information signal (like voice) onto a high-frequency carrier wave. It is necessary because: 1. Low-frequency signals cannot be transmit…
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