how electromagnetic waves carries energy?

Question

what are electromagnetic waves how to visualise their propagation in space ?what are recomended sites? how do they related to quntum mechanics?

Answer 1

EM waves carry energy in the same way that **all** oscillating systems store energy: It is constantly being changed from one form to another. In a pendulum all of the energy in the system is, at one instant, in potential form. Then later it is kinetic energy and, still later, potential again.

In the same way energy in an EM wave changes from being stored in an electric field to being stored in a magnetic field and back as it propagates through space.


Doug

Answer 2

Electromagnetic wave are light waves.

If you look at a chapter on light in a physic book, you will find different theory on how light travels. All Theories are valid to some extent but not a single theory can support all the phenomena of light.

You need to go to a college library. There are volumes written on this subject. If you are in high school your physics teacher or science teacher may have something to show you.

Start with the books that says introduction or introductory or for Dummy or for beginner.

Ask for a physic professor and request to see a wave, be very nice and be very very polite and be very nice again use words like please ,thank you...make him feel important (remember he is important to you to find this info). If he has a apparatus Sonometer, he will show you a sound wave, ask him if he has one.

Now after looking at sound wave you will get the idea about Electromagnetic wave. All the waves are different but have same characteristics(similar).

I am sure he has at least a picture and the description of the apparatus in his book on sound. He may tell you about electromagnetic wave also.

PS

I do not consider myself as an expert but I have written a book on this subject.

Answer 3

The basis of energy is physical time. Time is the value that allows all events only a centain length or existence to complete their desired objective. An illustration of this is found in walking the distance of one block

Were you to have 24 hours to do this, you could stop and visit with others along the way, stop and read a book, take a nap and any other thing you could think of. If you had a year to do this, there would be a lot of other things you could do along the way.

Time is like this in our lives. It allows only a certain amount of duration for you to complete any task. There is no more and there is no less. This value is known to us as "power". The more power in a car, the faster it moves in less amount of time. A person is able to trade time for power by using more time and using less power.

The basis of electromagnetic energy is that of the value "c". This value allows all events to flow at a specific rate so that the present flows into the past at the value of "c". Of course, this means that this also becomes the basis of all events, and is a source of energy unto itself. This concept is found to be correct when we consider the physics trilogy: E = mc2, m = E/c2, and c2 = E/m. Notice that the basis of the first two is the c2 value, and this value never changes, whereas that of energy and mass do. Then in the last equation the c2 value is also constant but that of mass and energy have the ability to change. As they change the value of c2 remains c2, even though its intensity is able to change (quantity).

There are two short writings "What is a Graviton" and The Problem and Repair of Relativity" at http://360.yahoo.com/noddarc that may be of interest to you.

Answer 4

Yes EM waves carry energy. We know that EM waves are varying electric and magnetic fields in space. Actually we are supplying energy to make this variation in the fields. So the energy exists in this movement of the field. Just as the energy exists in a moving body. when the waves reaches a conductor it tries to vary the fields associated with it and in this process the energy is transferred. Because the existing field will prevent this variation and the wave have to do some work to make it vary.

Answer 5

Wave has a dual nature. The waves carry energy in the form of photons having energy equal to hv where h is a constant and v is the frequency of the wave.

Answer 6

Electromagnetic waves surely carry energy .In particular light waves are nothing but stream of PHOTONS which have zero relative mass but due momentum they carry energy E=h/c where 'h' is plank's constant(=6.625*10^-34 joule-second) and 'c' is the velocity of light.i think that would be enough .

Answer 7

http://hyperphysics.phy-astr.gsu.edu/hbase/waves/emwv.html