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Propagation of Electromagnetic Waves I Video Lecture - Civil Engineering (CE)

FAQs on Propagation of Electromagnetic Waves I Video Lecture - Civil Engineering (CE)

1. What are electromagnetic waves?

Ans. Electromagnetic waves are a form of energy that is transmitted through space in the form of oscillating electric and magnetic fields. These waves are generated by the acceleration of charged particles and can travel through a vacuum or various mediums.

2. How do electromagnetic waves propagate?

Ans. Electromagnetic waves propagate through the process of self-sustaining electromagnetic field oscillations. As the electric field oscillates, it creates a magnetic field, and vice versa. These mutually reinforcing fields continuously regenerate each other, allowing the wave to propagate through space.

3. What are the different types of electromagnetic waves?

Ans. There are various types of electromagnetic waves, each characterized by its wavelength and frequency. The electromagnetic spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type of wave has different properties and applications.

4. How fast do electromagnetic waves travel?

Ans. Electromagnetic waves travel at the speed of light in a vacuum, which is approximately 299,792 kilometers per second (or about 186,282 miles per second). This speed is a fundamental constant in physics and represents the maximum speed at which information or energy can be transmitted.

5. What are the practical applications of electromagnetic waves?

Ans. Electromagnetic waves have numerous practical applications in everyday life. Some examples include radio and television broadcasting, wireless communication, radar systems, medical imaging (such as X-rays and MRI), heating and cooking (microwaves), and optical technologies (fiber optics, lasers). These applications rely on the ability of electromagnetic waves to carry information and interact with matter in various ways.

Text Transcript from Video

propagation of electromagnetic waves in
communication using radio waves an
antenna at the transmitter radiates the
electromagnetic waves
ium waves which traveled through the
space and reach the receiving antenna at
the other end as the e/m wave travels
away from the transmitter the strength
of the wave keeps on decreasing several
factors influence the propagation of e/m
waves and the path they follow at this
point it is also important to understand
the composition of the Earth's
atmosphere as it plays a vital role in
the propagation of e/m waves ground wave
to radiate signals with high efficiency
the antennas should have a size
comparable to the wavelength lambda of
the signal at least approximately lambda
by 4 at longer wavelengths that is at
lower frequencies the antennas have
large physical size and they are located
on or very near to the ground in
standard AM broadcast ground-based
vertical travels are generally used as
transmitting antennas for such antennas
ground has a strong influence on the
propagation of the signal the mode of
propagation is called surface wave
propagation and the wave glides over the
surface of the earth Aviv induces
current in the ground over which it
passes and it is attenuated as a result
of absorption of energy by the earth the
attenuation of surface waves increases
very rapidly with increasing frequency
the maximum range of coverage depends on
the transmitted power and frequency less
than a few megahertz
sky waves
in frequency range from a few megahertz
up to 30 to 40 megahertz long distance
communication can be achieved by I know
spheric reflection of radio waves back
towards the earth this mode of
propagation is called skywave
propagation and is used by shortwave
broadcast services the ionosphere is so
called
because of the presence of a large
number of ions or charged particles it
extends from a height of about 65
kilometers to about 400 kilometers above
the Earth's surface
ionization occurs due to the absorption
of the ultraviolet and other high-energy
radiation coming from the Sun by air
molecules the ionosphere is further
subdivided into several layers

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Jan 15, 2025 Last updated

Propagation of Electromagnetic Waves I for Civil Engineering (CE)2025 is part of Civil Engineering (CE) preparation. The notes and questions for Propagation of Electromagnetic Waves I have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Propagation of Electromagnetic Waves I covers all important topics for Civil Engineering (CE)2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Propagation of Electromagnetic Waves I.

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