Advertisements
Online Mock Tests
Chapters
2: Mathematical Methods
3: Motion in a Plane
4: Laws of Motion
5: Gravitation
6: Mechanical Properties of Solids
7: Thermal Properties of Matter
8: Sound
9: Optics
10: Electrostatics
11: Electric Current Through Conductors
12: Magnetism
▶ 13: Electromagnetic Waves and Communication System
14: Semiconductors
![Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 13 - Electromagnetic Waves and Communication System - Shaalaa.com](/images/physics-english-11-standard-maharashtra-state-board_6:314f14dcb519476f83adce5380e7a92f.jpg "Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 13 - Electromagnetic Waves and Communication System")
Advertisements
Solutions for Chapter 13: Electromagnetic Waves and Communication System
Below listed, you can find solutions for Chapter 13 of Maharashtra State Board Balbharati for Physics [English] 11 Standard Maharashtra State Board.
Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board 13 Electromagnetic Waves and Communication System Exercises [Pages 240 - 241]
Choose the correct option.
The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is
Infra-red radiation
X-ray
Microwave
Visible light
Choose the correct option.
Earth’s atmosphere is richest in
UV
IR
X-ray
Microwaves
Choose the correct option.
How does the frequency of a beam of ultraviolet light change when it travels from air into glass?
depends on the values of μ and ε
increases
decreases
remains same
Choose the correct option.
The direction of the EM wave is given by
`vec"E"xxvec"B"`
`vec"E".vec"B"`
along `vec"E"`
along `vec"B"`
Choose the correct option.
The maximum distance up to which TV transmission from a TV tower of height h can be received is proportional to
`"h"^(1//2)`
h
`"h"^(3//2)`
`"h"^2`
Choose the correct option.
The waves used by artificial satellites for communication purposes are
Microwave
AM radio waves
FM radio waves
X-rays
Choose the correct option.
If a TV telecast is to cover a radius of 640 km, what should be the height of the transmitting antenna?
32000 m
53000 m
42000 m
55000 m
Answer briefly.
State two characteristics of an EM wave.
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
What are EM waves?
Answer briefly.
How are EM waves produced?
Answer briefly.
Can we produce a pure electric or magnetic wave in space? Why?
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Answer briefly.
Why light waves travel in a vacuum whereas sound waves cannot?
What are the ultraviolet rays?
Answer briefly.
Give two uses of ultraviolet rays.
Answer briefly.
What are radio waves?
Answer briefly.
Give two uses of radio waves.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
Give a reason for the following:
It is necessary to use satellites for long-distance TV transmission. Why?
Answer briefly.
Name the three basic units of any communication system.
Answer briefly.
What is a carrier wave?
Answer briefly.
Why high-frequency carrier waves are used for the transmission of audio signals?
Answer briefly.
What is the modulation?
Answer briefly.
What is meant by amplitude modulation?
Answer briefly.
What is meant by noise?
Answer briefly.
What is meant by bandwidth?
Answer briefly.
What is demodulation?
Answer briefly.
What type of modulation is required for television broadcast?
Answer briefly.
How does the effective power radiated by an antenna vary with wavelength?
Answer briefly.
Why should broadcasting programs use different frequencies?
Answer briefly.
Explain the necessity of a carrier wave in communication.
Answer briefly.
Why does amplitude modulation give noisy reception?
Answer briefly.
Explain why is modulation needed.
Solve the numerical problem.
Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 108 m/s.
Solve the numerical problem.
Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 1018 Hz.
Solve the numerical problem.
The speed of light is 3 × 108 m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10−7 m.
Calculate the wavelength of a microwave of a frequency of 8.0 GHz.
Solve the numerical problem.
In an EM wave, the electric field oscillates sinusoidally at a frequency of 2 × 1010 Hz. What is the wavelength of the wave?
Solve the numerical problem.
The amplitude of the magnetic field part of a harmonic EM wave in a vacuum is B0 = 5 × 10−7 T. What is the amplitude of the electric field part of the wave?
Solve the numerical problem.
A TV tower has a height of 200 m. How much population is covered by TV transmission if the average population density around the tower is 1000/km2? (Radius of the Earth = 6.4 × 106 m)
Solve the numerical problem.
Height of a TV tower is 600 m at a given place. Calculate its coverage range if the radius of the Earth is 6400 km. What should be the height to get the double coverage area?
Solve the numerical problem.
A transmitting antenna at the top of a tower has a height of 32 m and that of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight mode? The given radius of Earth is 6.4 × 106 m.
Solutions for 13: Electromagnetic Waves and Communication System
Balbharati solutions for Physics [English] 11 Standard Maharashtra State Board chapter 13 - Electromagnetic Waves and Communication System
Shaalaa.com has the Maharashtra State Board Mathematics Physics [English] 11 Standard Maharashtra State Board Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Balbharati solutions for Mathematics Physics [English] 11 Standard Maharashtra State Board Maharashtra State Board 13 (Electromagnetic Waves and Communication System) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Balbharati textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Physics [English] 11 Standard Maharashtra State Board chapter 13 Electromagnetic Waves and Communication System are EM Wave, Electromagnetic Spectrum, Propagation of EM Waves, Introduction to Communication System, Modulation.
Using Balbharati Physics [English] 11 Standard Maharashtra State Board solutions Electromagnetic Waves and Communication System exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Balbharati Solutions are essential questions that can be asked in the final exam. Maximum Maharashtra State Board Physics [English] 11 Standard Maharashtra State Board students prefer Balbharati Textbook Solutions to score more in exams.
Get the free view of Chapter 13, Electromagnetic Waves and Communication System Physics [English] 11 Standard Maharashtra State Board additional questions for Mathematics Physics [English] 11 Standard Maharashtra State Board Maharashtra State Board, and you can use Shaalaa.com to keep it handy for your exam preparation.
