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As radio waves of low frequencies cannot...

As radio waves of low frequencies cannot be transmitted to long distances, a high frequency carrier signal is superposed on it. This process is called

A

A) amplification

B

B) rectification

C

C) modulation

D

D) oscillation

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • Radio waves of low frequencies cannot be transmitted to long distances. So thes are superposed on a high frequency carrier signal. This process is known as

    A
    amplification
    B
    rectification
    C
    modulation
    D
    demodulation

  • An audio signal of 15 kHz frequency cannot be transmitted over long distances without modulation because

    A
    the size of the required antenna would be at least 5 km which is inconvenient
    B
    the audio signal cannot be transmitted through sky waves
    C
    the size of the requied antenna would be at least 20 km which is inconvenient
    D
    effective power transmitted would be very low, if the size of the antenna is less than 5 km

  • A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 ms^(-1) is :

    A
    103 Hz
    B
    106 Hz
    C
    97 Hz
    D
    100 Hz

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    with respect to any data signal, the frequency of a carrier wave is much _____.

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