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Why are high frequency carrier waves use...

Why are high frequency carrier waves used for transmission ?

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### Step-by-Step Solution: 1. **Understanding Carrier Waves**: - Carrier waves are electromagnetic waves that are used to carry information over long distances. These waves can be modulated to encode the information being transmitted. 2. **Speed of High-Frequency Waves**: - High-frequency carrier waves travel at the speed of light in a vacuum, which is approximately \(3 \times 10^8\) meters per second. This high speed allows for rapid transmission of data. ...
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Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. In india the radio signals are boarcast using-

Both amplitude modulation (AM) and frequency modulation (FM) are used for radio broadcasting. The amplitude of the high frequency carrier wave is varied or modulated in accordance with the variations in the amplitude of the audio signals that are to be transmitted, in te process of amplitude modulation in frequency modulation te amplitude of the carrier remains constant but its frequency is varied inn accordance withh the audio signal. Reception with AM signals is in general is affected by interference of various kinds ad elaborated equipment is required for FM broadcast. The rangeof a transmitter is

What is the range of frequencies used for TV transmission? What is common between these waves and light waves?

The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is

Write two factors which justify the need of modulating a low frequnecy signal into high frequencies before transmission .

The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. If modulation factor is 100% , the amplitude change of carrier wave is

Assertion : The information contained in our original low frequency baseband signal is to be translated into high or radio frequencies before transmission. Reason: For transmitting a signal, the antenna should have a size comparable to the wav elength of the signal.

If omega_c and omega_m are angular frequencies of carrier wave and modulating signal respectively, then Band width of amplitude modulated waves is equal to

XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SET I
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  2. ATV tower has a height of 150m. By how much the height of tower be inc...

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  3. Why are high frequency carrier waves used for transmission ?

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  4. What is meant by term 'modulation' ? Draw a block diagram of a simple ...

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  5. A radioactive nucleus undergoes a series of deacy according to the sch...

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  6. A thin spherical shell of radius R has charge Q spread uniformly over ...

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  7. A proton and alpha particle are accelerated through the same accelerat...

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  8. In a singleslit diffraction experiment, when a tiny circular obstacle ...

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  9. (a) Define self inductance. Write its S.I. units (b) Derive and expr...

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  10. Derive the expression for force per unit length between two long strai...

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  11. (a) Deriver and expression for the average power consumed in a series ...

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  12. (a) Derive the relationship between the peak and the rms value of curr...

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  13. (i) Draw a circuit diagram to study the input and output characteristi...

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  14. Trace the rays of light showing the formation of an image due to a poi...

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  15. Draw the labelled ray diagram for the formation of image by a compound...

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  16. When electrons drift in a metal from lower to higher potential, does i...

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  17. At a place, the horizontal component of earth's magnetic field is B an...

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  18. Show on a graph, the variation of resistivity with temperature for a t...

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  19. Why should electrostatic field be zero inside a conductor ?

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  20. Name the physical quantity which remains same for microwaves of wavele...

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