Assertion (A): Television signals are receive | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Television signals typically operate in the frequency range of $40 MHz$ to $900 MHz$. Sky-wave propagation relies on the reflection of electromagn

Vedclass · Accepted Answer

$A$ is false but $R$ is true.

Vedclass · Answer

(D) Television signals typically operate in the frequency range of $40 MHz$ to $900 MHz$. Sky-wave propagation relies on the reflection of electromagnetic waves by the ionosphere,which is only effective for frequencies in the range of $3 MHz$ to $30 MHz$. Since television signal frequencies are much higher than $30 MHz$,they penetrate the ionosphere and are not reflected back to Earth. Therefore,television signals cannot be received through sky-wave propagation; they require line-of-sight communication or satellite communication. Thus,the Assertion $(A)$ is false,while the Reason $(R)$ is a true statement regarding the ionospheric reflection range.

Assertion $(A)$: Television signals are received through sky-wave propagation.
Reason $(R)$: The ionosphere reflects electromagnetic waves of frequencies in the range $(3-30)$ $MHz$.
Choose the correct option.

Similar Questions

An amplitude modulated wave is represented by $10[1+0.6 \sin(40 \times 10^3 t)] \sin(4 \times 10^6 t)$ volt,where $t$ is in seconds. The ratio of the upper sideband frequency to the lower sideband frequency is:

$A$ basic communication system consists of:
$(a)$ Transmitter
$(b)$ Information source
$(c)$ User of information
$(d)$ Channel
$(e)$ Receiver
The correct sequence of the arrangement is:

$A$ sinusoidal carrier voltage is amplitude modulated. The resultant amplitude modulated wave has maximum and minimum amplitude of $120 \, V$ and $80 \, V$ respectively. The amplitude of each sideband is $.......... \, V$.

When the receiving antenna is on the ground,the range of a transmitting antenna of height $980 \ m$ is (Radius of the earth $= 6400 \ km$) (in $km$)

$A$ carrier signal $C(t)=25 \sin(2.512 \times 10^{10} t)$ is amplitude modulated by a message signal $m(t)=5 \sin(1.57 \times 10^{8} t)$ and transmitted through an antenna. What will be the bandwidth of the modulated signal?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion $(A)$: Television signals are received through sky-wave propagation.Reason $(R)$: The ionosphere reflects electromagnetic waves of frequencies in the range $(3-30)$ $MHz$.Choose the correct option.