Home
Class 12
PHYSICS
A signal Acosomegat is transmitted using...

A signal `Acosomegat` is transmitted using `v_(0) sinomega_(0)t` modulated (AM) signal is:

A

`v_(0)sinomega_(0)t+ (A)/(2)sin(omega_(0)-omega)t+ (A)/(2)(omega_(0)+omega)t`

B

`v_(0)sin[omega_(0)(1+0.01Asinomegat)t]`

C

`v_(0)sinomega_(0)t+ Acosomegat`

D

`(v_(0)+ A)cosomegatsinomega_(0)t`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem of determining the amplitude-modulated (AM) signal when a message signal \( A \cos(\omega t) \) is transmitted using a carrier wave \( V_0 \sin(\omega_0 t) \), we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Message and Carrier Signals**: - The message signal is given as \( m(t) = A \cos(\omega t) \). - The carrier signal is given as \( c(t) = V_0 \sin(\omega_0 t) \). 2. **Understand Amplitude Modulation**: - In amplitude modulation, the amplitude of the carrier wave is varied in accordance with the message signal. The general form of an AM wave can be expressed as: \[ s(t) = A_c \left(1 + m(t)\right) c(t) \] - Here, \( A_c \) is the amplitude of the carrier wave, \( m(t) \) is the normalized message signal, and \( c(t) \) is the carrier wave. 3. **Substituting the Signals**: - Substitute \( m(t) \) and \( c(t) \) into the AM wave equation: \[ s(t) = V_0 \left(1 + \frac{A}{V_0} \cos(\omega t)\right) \sin(\omega_0 t) \] 4. **Simplifying the Expression**: - This can be expanded as: \[ s(t) = V_0 \sin(\omega_0 t) + A \cos(\omega t) \sin(\omega_0 t) \] 5. **Using Trigonometric Identities**: - To simplify \( A \cos(\omega t) \sin(\omega_0 t) \), we can use the identity: \[ \sin A \cos B = \frac{1}{2} \left( \sin(A + B) + \sin(A - B) \right) \] - Applying this identity: \[ A \cos(\omega t) \sin(\omega_0 t) = \frac{A}{2} \left( \sin(\omega_0 t + \omega t) - \sin(\omega_0 t - \omega t) \right) \] 6. **Final Expression**: - Therefore, the complete expression for the AM wave becomes: \[ s(t) = V_0 \sin(\omega_0 t) + \frac{A}{2} \left( \sin((\omega_0 + \omega)t) - \sin((\omega_0 - \omega)t) \right) \] 7. **Conclusion**: - The final amplitude-modulated signal is: \[ s(t) = V_0 \sin(\omega_0 t) + \frac{A}{2} \sin((\omega_0 - \omega)t) - \frac{A}{2} \sin((\omega_0 + \omega)t) \]

To solve the problem of determining the amplitude-modulated (AM) signal when a message signal \( A \cos(\omega t) \) is transmitted using a carrier wave \( V_0 \sin(\omega_0 t) \), we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Message and Carrier Signals**: - The message signal is given as \( m(t) = A \cos(\omega t) \). - The carrier signal is given as \( c(t) = V_0 \sin(\omega_0 t) \). ...
Promotional Banner

Topper's Solved these Questions

  • GRAVITATION

    DISHA PUBLICATION|Exercise EXERCISE-2|30 Videos
  • LAWS OF MOTION

    DISHA PUBLICATION|Exercise Exercise-2 : Concept Applicator|30 Videos

Similar Questions

Explore conceptually related problems

Audio signal cannot be transmitted because

What is a modulating signal ?

In process of amplitude modulation of signal to be transmitted . Signal to be modulated is given by m(t)=A_(m) sin omega_(m)t , carrier wave is given by c(t)=A_(c) sin omega_(c)t , modulated signal c_(m)(t) is given by

If a carrier wave c(t)=A sin omega_(c)t is amplitude modulated by a modulator signal m(t)=A sin omega_(m)t then the equation of modulated signal [C_(m)(t)] and its modulation index are respectively

For transmitting audio signal properly

A carrier wave c(t)=A_(c) sin omega_(c) t is amplitude modulated by a modulating signal m(t)=A_(m) sin omega_(m) t . The maximum and minimum amplitudes are found to be 16 V and 4 V , respectively. Calculate the modulation index.

The total power content of an AM wave is 1500 W. For 100% modulation, the power transmitted by the carrier swing of 200 kHz and a modulating signal 10 kHz is

Equation of messages signal m = 2 sin omega_(m)(t) and carrier signal c = 4 sin omega_(C)(t) . The equation of modulating signal will be

A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of 80% will be :

DISHA PUBLICATION-JEE MAINS- 2019 (HELD ON :9TH APRIL 2019 (SHIFT-I))-QUESTIONS
  1. For a given gas at 1 atm pressure, rms speed of the molecules is 200 m...

    Text Solution

    |

  2. An HCl molecule has rotational, translational and vibrational motions....

    Text Solution

    |

  3. A simple pendulum oscillating in air has period T. The bob of the pend...

    Text Solution

    |

  4. The pressure wave, P=0.01 sin [1000 t-3x]Nm^(-2), corresponds to the...

    Text Solution

    |

  5. A string is clamped at both the ends and it is vibrating in its 4^(th)...

    Text Solution

    |

  6. A system of three charges are placed as shown in the figure: If...

    Text Solution

    |

  7. Determine the charge on the capacitor in the following circuit:

    Text Solution

    |

  8. A capacitor with capacitance 5mu F is charged to 5 mu C . If the p...

    Text Solution

    |

  9. A wire of resistance R is bent to form a square ABCD as shown in the f...

    Text Solution

    |

  10. A rectangular coil (Dimension 5 cmxx2.5 cm) with 100 turns, carrying a...

    Text Solution

    |

  11. A rigid square of loop of side 'a' and carrying current I(2) is lying ...

    Text Solution

    |

  12. A moving coil galvanometer has resistance 50 Omega and it indicates ...

    Text Solution

    |

  13. The total number of turns and cross-section area in a solenoid is fixe...

    Text Solution

    |

  14. The magnetic field of a plane electromagnetic wave is given by: vec(B)...

    Text Solution

    |

  15. A signal Acosomegat is transmitted using v(0) sinomega(0)t modulated...

    Text Solution

    |

  16. A concave mirror used for face viewing has focal length of 0.4 m. The ...

    Text Solution

    |

  17. The figure shows a Young's double slit experimental setup. It is obser...

    Text Solution

    |

  18. The electric field of light wave is given as vec(E)=10^(-3)cos((2 pi ...

    Text Solution

    |

  19. Taking the wavelength of first Balmer line in hydrogen spectrum (n = 3...

    Text Solution

    |

  20. An NPN transistor is used in common emitter configuration as an amplif...

    Text Solution

    |