Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 18

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In amplitude modulated waves, the maximum amplitude is $30 mV$ and the minimum is $5 mV$ , then find out the modulating index.

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Important Questions on Communication Systems

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 19

The voltage of modulating wave of

5 V

with

10 MHz

frequency it was superimposed on the carrier wave of frequency

20 MHz

and

20 V

, then the modulation index:

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 20

Find the area covered by a transmitting antenna of height

50 m

:

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 22

If modulation index is

\frac{1}{2}

and power of carrier wave is

2 units

, then what will be the total power of side-band:-

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 23

Long-distance communication between two points on the earth is achieved by,

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 24

In skywave communication which of the frequency will be reflected back by the ionospheric layer having electron density

4 \times 10^{6} m^{- 3}

?

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 25

In a skywave propagation, the maximum frequency transmitted is

27 MHz

, then the ion density (per

m^{3}

) is

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 26

What should be the minimum height of the tower, so that signals can be sent up to distance $R$ ?

( $R_{e} =$ The radius of the earth)

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Beta Question Bank for Medical: Physics>Chapter 36 - Communication Systems>Exercise (Conceptual Questions)>Q 27

In amplitude modulation index is

0.6

and

V_{\max} = 5 V

, then the value of

V_{\min}

will be:-