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Q.

Given below are two statements: Statement I: A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth requirement for the signal is 4 kHz.Statement II: The side band frequencies are 1002 kHz and 998 kHz.In the light of the above statements, choose the correct answer from the options given below:

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a

Statement I is false but statement II is true

b

Both statement I and statement II is true

c

Statement I is true but statement II is false

d

Both statement I and statement II are false

answer is B.

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Detailed Solution

U·S·B=fC+fm L.S. B=fC-fm B.w =fc+fm-fc-fm B.w =fc+fm-fc+fm B.w =2fmGiven : fm=2 kHz  , fc=1000 kHz B.w =4 kHz U.S. B=1000+2=1002 kHz L.S.B =1000-2=998 kHz
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