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Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter1 Mark
MCQ
The audio signal:
  • A
    Can be sent directly over the air for large distance
  • B
    Cannot be sent directly over the air for large distance
  • C
    Posses very high frequency
  • D
    None of above
✓

Answer

  1. Cannot be sent directly over the air for large distance

Explanation:

An Audio signal may vary from 20Hz to 20KHz, But in general, it is around 200Hz only,.

This Frequency when transmitted directly to air for long-distance is attenuated and a signal is lost in the air, That's why such frequency is first modulated to higher frequencies of order(MHz) and then transmitted to air.

Hence audio signals can't be transmitted directly to air for long distances.

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