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Home  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Communication Systems

Match the following for a FM Wave:

$\begin{array} \text {a.}\text{ Amplitude} & \text{1. Changes with Modulation} \\ \text {b. Carrier Frequency} & \text{2. Constant with Modulation} \\ \text {c. Value of Modulation Index} & \text {3. Can be greater than 1}\\ \text {} & \text {4. Cannot be greater than 1} \end{array}$

1 Answer

In frequency modulation (FM), the amplitude of the carrier is kept constant but the frequency $f_c$ of the carrier is varied by the modulating signal.
The carrier frequency changes according to the strength of the modulating signal and value of modulation index ($m_f$) can be more than 1.
Therefore the correct match is as follows:
$\begin{array} \text {a.}\text{ Amplitude} & \text{2. Constant with Modulation} \\ \text {b. Carrier Frequency} & \text{1. Changes with Modulation} \\ \text {c. Value of Modulation Index} & \text {3. Can be greater than 1}\\ \end{array}$
answered Jul 13, 2014 by balaji.thirumalai
 

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