EASY
12th CBSE
IMPORTANT
Earn 100

Calculate the length of a half wave dipole antenna at :

(i) 1 MHz

(ii) 100 MHz and

(iii) 1000 MHz
What conclusion you draw from the results?

Important Questions on Communication Systems

EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 2
In an amplitude modulation diode detector, the output circuit consists of R=1 MΩ and C=1 pF Calculate the carrier frequency it can detect.
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 1
The TV singles have a bandwidth of 4.7 MHz. What is the number of channels that can be accommodated in bandwidth of 4700 GHz?
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 1
On a particular day, it was found that frequencies higher than 9MHz are not reflected by the ionosphere. Calculate the maximum electron density of the ionosphere. 
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 2
The electron density of a layer of ionosphere is 1012 m-3. Calculate the critical frequency of reflection of radio waves from this layer.
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 3
A TV tower has a height of 500 m at a given place. Calculate its coverage range, if the radius of the earth is 6400 km.
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 4
A TV tower has height of 100 m. How much population is covered by TV broadcast? Given radius of the earth =6.4×106 m and average density of population =103 km-2.
EASY
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 5
On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to decrease to 8 MHz. Calculate the ratio of the maximum electron densities of the ionosphere on the two days.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 7 - Communication Systems>Problems For Practice>Q 6
A transmitting antenna at the top of a tower has a height of 45 m and the height of the receiving antenna is 80 m. What is the maximum distance between them, for satisfactory communication in LOS mode? (Radius of earth=6400 km)