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In radio-communication, the signals emitted by transmitting antenna are reflected on
  • a)
    stratosphere
  • b)
    ozonosphere
  • c)
    ionosphere
  • d)
    troposphere
Correct answer is option 'C'. Can you explain this answer?
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In radio-communication, the signals emitted by transmitting antenna ar...
Understanding Radio Communication and the Ionosphere
In radio communication, the ability of signals to travel long distances is significantly influenced by the Earth's atmosphere. Among various atmospheric layers, the ionosphere plays a crucial role.

What is the Ionosphere?
- The ionosphere is a region of Earth's upper atmosphere, extending from about 30 miles (48 km) to 600 miles (965 km) above the Earth’s surface.
- It contains a high concentration of ions and free electrons, which are created by the sun's ultraviolet radiation.

Role of the Ionosphere in Radio Communication
- **Reflection of Signals**: The ionosphere reflects radio waves back to the Earth, allowing them to travel beyond the horizon. This is particularly important for long-distance communication.
- **Frequency Dependency**: Different frequencies interact with the ionosphere in various ways. Lower frequencies (like AM radio) can reflect better, while higher frequencies (like FM) may pass through.

Benefits of Ionospheric Reflection
- **Long-Distance Communication**: Signals can travel thousands of miles without the need for satellites or repeaters.
- **Enhanced Coverage**: This reflection allows for a larger coverage area, making it possible for remote areas to receive radio broadcasts.

Conclusion
In summary, the ionosphere is vital for radio communication because it reflects signals, enabling long-distance transmission. This characteristic makes option 'C' the correct answer, highlighting the importance of atmospheric layers in communication technology.
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Directions: Read the passage carefully and choose the best answer to the question out of the four alternatives.The field of medicine forces a confrontation between scientific and everyday language. Outside the world of the research laboratory and clinic, there exists the daily routine of medical practice, a situation where a doctor tries to understand the problems of a patient, and the patient attempts to understand the doctor's diagnosis. The initial statement of the symptoms of any disease is of critical importance as it guides the doctor's search for the clinical signs of the condition. Similarly, the doctor's explanation of a problem, and the recommendation for treatment, need to be clear and complete if the patient is to understand and follow the correct course of action. The need for careful listening and expression by both parties should be obvious in a field as sensitive and serious as health. Patients worried about their heath are often uncertain and confused in their accounts. Busy doctors will not have the time to take up every point the patient has referred to. Moreover, the tradition of medical interviewing hinders the development of a genuine communication.Q. Doctors are sometimes unable to treat the patients properly because

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In radio-communication, the signals emitted by transmitting antenna are reflected ona)stratosphereb)ozonospherec)ionosphered)troposphereCorrect answer is option 'C'. Can you explain this answer?
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