(D) The wavelength $\lambda$ is given by the formula $\lambda = \frac{c}{f}$.Substituting the given values: $c = 3 \times 10^8 \text{ m/s}$ and $f = 2

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(D) The wavelength $\lambda$ is given by the formula $\lambda = \frac{c}{f}$.Substituting the given values: $c = 3 \times 10^8 \text{ m/s}$ and $f = 20 \times 10^6 \text{ Hz}$.$\lambda = \frac{3 \times 10^8}{20 \times 10^6} = \frac{300}{20} = 15 \text{ m}$.For effective radiation,the antenna length $L$ should be at least $\frac{\lambda}{4}$.$L = \frac{15}{4} = 3.75 \text{ m}$.

Class 12 Physics Communication Communication

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For effective radiation of a wave with a frequency of $20 \text{ MHz}$,what should be the length of the antenna in $m$?

A
$5$
B
$7.5$
C
$2$
D
$3.75$

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Communication

Which of the following devices is not a transducer?

Easy

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$A$ carrier wave of peak voltage $14\,V$ is used for transmitting a message signal. The peak voltage of the modulating signal required to achieve a modulation index of $80\%$ will be.......$V$

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Which of the following options is $NOT$ correct? We need modulation for:

Medium

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If the area covered by an $FM$ radio station is to be tripled,the height of the antenna must be .......

Medium

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Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).
Column $A$ Column $B$
$A$. $D$-layer $I$. $250-400 \ km$
$B$. $E$-layer $II$. $170-190 \ km$
$C$. $F_1$-layer $III$. $95-120 \ km$
$D$. $F_2$-layer $IV$. $65-75 \ km$

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Column $A$	Column $B$
$A$. $D$-layer	$I$. $250-400 \ km$
$B$. $E$-layer	$II$. $170-190 \ km$
$C$. $F_1$-layer	$III$. $95-120 \ km$
$D$. $F_2$-layer	$IV$. $65-75 \ km$

For effective radiation of a wave with a frequency of $20 \text{ MHz}$,what should be the length of the antenna in $m$?

Similar Questions

Which of the following devices is not a transducer?

$A$ carrier wave of peak voltage $14\,V$ is used for transmitting a message signal. The peak voltage of the modulating signal required to achieve a modulation index of $80\%$ will be.......$V$

Which of the following options is $NOT$ correct? We need modulation for:

If the area covered by an $FM$ radio station is to be tripled,the height of the antenna must be .......

Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).Column $A$Column $B$$A$. $D$-layer$I$. $250-400 \ km$$B$. $E$-layer$II$. $170-190 \ km$$C$. $F_1$-layer$III$. $95-120 \ km$$D$. $F_2$-layer$IV$. $65-75 \ km$

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Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).
Column $A$ Column $B$
$A$. $D$-layer $I$. $250-400 \ km$
$B$. $E$-layer $II$. $170-190 \ km$
$C$. $F_1$-layer $III$. $95-120 \ km$
$D$. $F_2$-layer $IV$. $65-75 \ km$