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Communication Systems Free Doubts and Solutions

CBSE - XII Science - Physics - Communication Systems

WHAT IS DIFFRENCE BETWEEN SONAR ANA sound detecting radar?

Asked by Shahwar 15th June 2015, 9:20 PM
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CBSE - XII Science - Physics - Communication Systems

what is the need for modulation?
what are sky waves , space waves and ground waves?
 

Asked by gsonu953 3rd March 2015, 10:32 AM
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CBSE - XII Science - Physics - Communication Systems

With the help of block diagram describe how an amplitude modulated signal is detected by a radio receiver. Show graphically the detected wave and the msg signal retrieved.

Asked by Aksa Merin Saji 19th February 2015, 6:21 PM
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CBSE - XII Science - Physics - Communication Systems

explain detection of am waves 
 

Asked by Indra 25th December 2014, 8:39 PM
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CBSE - XII Science - Physics - Communication Systems

A cell of emf (ξ) and internal resistance (r) is connected across a variable external resistance (R). Plot graph to show variation of (i) ξ with R (ii) Terminal p.d of the cell with Resistance(R).

Asked by inderjeet.saluja 23rd August 2014, 2:02 PM
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CBSE - XII Science - Physics - Communication Systems

 

Asked by Praveen Kumar 2nd May 2014, 8:32 PM
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CBSE - XII Science - Physics - Communication Systems

From a tower of height H, a particle is thrown vertically upwards with a speed u. The

time taken by the particle, to hit the ground, is n times that taken by it to reach the

highest point of its path. The relation between H, u and n is:

Answer:-2gH=n(n-2)(u*u)

why?

Asked by Sameer Raj 17th April 2014, 10:27 AM
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CBSE - XII Science - Physics - Communication Systems


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Asked by NIKHIL 14th April 2014, 4:43 PM
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CBSE - XII Science - Physics - Communication Systems

sir i have only 5 days to prepare how should i approach these 5 days to prepare for jee.

how should i do  for chemistry physics and maths . please reply urgenty...,,,,,

Asked by sudeep mohanty 29th March 2014, 8:03 PM
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CBSE - XII Science - Physics - Communication Systems

the transmission of signals using ground waves are restricted upto a frequency of about 1500kHz. Why?

Asked by sai saranya s 3rd March 2014, 7:33 PM
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