Swapna S.

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Swapna is located in Btm Layout 2nd Stage, Bangalore. Swapna takes at students Home and Regular Classes- at her Home. She is well versed in English and Hindi.

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Answers by Swapna S. (1068)

Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude... ...more

For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index μ. What would be the value of μ if the minimum amplitude is zero volt?

Maximum amplitude, Amax = 10 V Minimum amplitude, Amin = 2 V Modulation index μ, is given by the relation: ...more

Maximum amplitude, A_max = 10 V

Minimum amplitude, A_min = 2 V

Modulation index μ, is given by the relation:

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

A modulating signal is a square wave, as shown in Fig. 15.14. The carrier wave is given by (i)... ...more

A modulating signal is a square wave, as shown in Fig. 15.14.

The carrier wave is given by

(i) Sketch the amplitude modulated waveform

(ii) What is the modulation index?

It can be observed from the given modulating signal that the amplitude of the modulating signal, Am = 1 V It is given that the carrier wave c (t) = 2 sin (8πt) ∴Amplitude of the carrier wave, Ac = 2 V Time period of the modulating signal Tm = 1 s The angular frequency of the modulating signal... ...more

It can be observed from the given modulating signal that the amplitude of the modulating signal, A_m = 1 V

It is given that the carrier wave c (t) = 2 sin (8πt)

∴Amplitude of the carrier wave, A_c = 2 V

Time period of the modulating signal T_m = 1 s

The angular frequency of the modulating signal is calculated as:

The angular frequency of the carrier signal is calculated as:

From equations (i) and (ii), we get:

The amplitude modulated waveform of the modulating signal is shown in the following figure.

(ii)Modulation index,

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak... ...more

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

Amplitude of the carrier wave, Ac = 12 V Modulation index, m = 75% = 0.75 Amplitude of the modulating wave = Am Using the relation for modulation index: ...more

Amplitude of the carrier wave, A_c = 12 V

Modulation index, m = 75% = 0.75

Amplitude of the modulating wave = A_m

Using the relation for modulation index:

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna... ...more

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81m tall. How much service area can it cover if the receiving antenna is at the ground level?

Line-of-sight communication means that there is no physical obstruction between the transmitter and the receiver. In such communications it is not necessary for the transmitting and receiving antennas to be at the same height. Height of the given antenna, h = 81 m Radius of earth, R = 6.4 × 106... ...more

Height of the given antenna, h = 81 m

Radius of earth, R = 6.4 × 10⁶ m

For range, d = (2Rh)^½, the service area of the antenna is given by the relation:

A = πd²

= π (2Rh)

= 3.14 × 2 × 6.4 × 10⁶× 81

= 3255.55 × 10⁶ m²

= 3255.55

∼ 3256 km²

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

Digital signals (i) Do not provide a continuous set of values, (ii) Represent values as discrete... ...more

Digital signals

(i) Do not provide a continuous set of values,

(ii) Represent values as discrete steps,

(iii) Can utilize binary system, and

(iv) Can utilize decimal as well as binary systems.

Which of the above statements are true?

(a) (i) and (ii) only

(b) (ii) and (iii) only

(d) All of (i), (ii), (iii) and (iv).

(c) Answer: A digital signal uses the binary (0 and 1) system for transferring message signals. Such a system cannot utilise the decimal system (which corresponds to analogue signals). Digital signals represent discontinuous values.

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Answers by Swapna S. (1068)

Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude... ...more

Maximum amplitude, Amax = 10 V Minimum amplitude, Amin = 2 V Modulation index μ, is given by the relation: ...more

Maximum amplitude, A_max = 10 V

Minimum amplitude, A_min = 2 V

Modulation index μ, is given by the relation:

Like 0

Answers 1 Comments

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

A modulating signal is a square wave, as shown in Fig. 15.14. The carrier wave is given by (i)... ...more

A modulating signal is a square wave, as shown in Fig. 15.14.

The carrier wave is given by

(i) Sketch the amplitude modulated waveform

(ii) What is the modulation index?

It can be observed from the given modulating signal that the amplitude of the modulating signal, A_m = 1 V

It is given that the carrier wave c (t) = 2 sin (8πt)

∴Amplitude of the carrier wave, A_c = 2 V

Time period of the modulating signal T_m = 1 s

The angular frequency of the modulating signal is calculated as:

The angular frequency of the carrier signal is calculated as:

From equations (i) and (ii), we get:

The amplitude modulated waveform of the modulating signal is shown in the following figure.

(ii)Modulation index,

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak... ...more

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

Amplitude of the carrier wave, Ac = 12 V Modulation index, m = 75% = 0.75 Amplitude of the modulating wave = Am Using the relation for modulation index: ...more

Amplitude of the carrier wave, A_c = 12 V

Modulation index, m = 75% = 0.75

Amplitude of the modulating wave = A_m

Using the relation for modulation index:

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna... ...more

Height of the given antenna, h = 81 m

Radius of earth, R = 6.4 × 10⁶ m

For range, d = (2Rh)^½, the service area of the antenna is given by the relation:

A = πd²

= π (2Rh)

= 3.14 × 2 × 6.4 × 10⁶× 81

= 3255.55 × 10⁶ m²

= 3255.55

∼ 3256 km²

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Answered on 16/10/2019 Learn CBSE/Class 12/Science/Physics/Unit 10-Communication Systems/COMMUNICATION SYSTEMS/NCERT Solutions/Exercise 15

Digital signals (i) Do not provide a continuous set of values, (ii) Represent values as discrete... ...more

Digital signals

(i) Do not provide a continuous set of values,

(ii) Represent values as discrete steps,

(iii) Can utilize binary system, and

(iv) Can utilize decimal as well as binary systems.

Which of the above statements are true?

(a) (i) and (ii) only

(b) (ii) and (iii) only

(d) All of (i), (ii), (iii) and (iv).

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Answers 1 Comments

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Swapna is located in Btm Layout 2nd Stage, Bangalore. Swapna takes at students Home and Regular Classes- at her Home. She is well versed in English and Hindi.

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