# How cross-section area of single E-M wave looks like?

• gfgts250
In summary: It will be our minimal distance from which we can still say that there is a single E-M wave present. If we moved electron even closer to source, we would not be able to see single photon anymore as it would merge with other waves. That's why amplitude of E-M wave decreases as we move away from source. In summary, in order to convert energy flux [W/m^2] to energy [J], we need to multiply it by time (T) and by area. The area we are interested in, the area our illuminated object has, the area of the slit through our plane wave has passed.
gfgts250 said:
I hope you read entire post
Just some general advice, if you want people to read an entire post and if you want responses to the entire post then you need to concentrate on brevity. People in any internet forum will respond only to the particular statements that interest them; that is the nature of an internet forum.

Don't get upset if people respond to stuff you were not interested in and do not respond to stuff that you were interested in. Instead of getting upset, get concise so that your posts contain only things where you want responses.

<h2>1. What is the cross-section area of a single electromagnetic (E-M) wave?</h2><p>The cross-section area of a single E-M wave is the area that is perpendicular to the direction of the wave's propagation. It represents the physical extent of the wave in space.</p><h2>2. How does the cross-section area of an E-M wave change with distance?</h2><p>The cross-section area of an E-M wave does not change with distance. It remains constant as the wave propagates through space.</p><h2>3. What factors affect the cross-section area of an E-M wave?</h2><p>The cross-section area of an E-M wave is affected by the wavelength and amplitude of the wave. A shorter wavelength and larger amplitude will result in a smaller cross-section area, while a longer wavelength and smaller amplitude will result in a larger cross-section area.</p><h2>4. Can the cross-section area of an E-M wave be measured?</h2><p>Yes, the cross-section area of an E-M wave can be measured using specialized equipment such as antennas or receivers. These devices can detect and measure the strength of the E-M wave, which can then be used to calculate the cross-section area.</p><h2>5. Is the cross-section area of an E-M wave constant for all types of waves?</h2><p>No, the cross-section area of an E-M wave can vary depending on the type of wave. For example, a plane wave will have a constant cross-section area, while a spherical wave will have a varying cross-section area that decreases with distance from the source.</p>

## 1. What is the cross-section area of a single electromagnetic (E-M) wave?

The cross-section area of a single E-M wave is the area that is perpendicular to the direction of the wave's propagation. It represents the physical extent of the wave in space.

## 2. How does the cross-section area of an E-M wave change with distance?

The cross-section area of an E-M wave does not change with distance. It remains constant as the wave propagates through space.

## 3. What factors affect the cross-section area of an E-M wave?

The cross-section area of an E-M wave is affected by the wavelength and amplitude of the wave. A shorter wavelength and larger amplitude will result in a smaller cross-section area, while a longer wavelength and smaller amplitude will result in a larger cross-section area.

## 4. Can the cross-section area of an E-M wave be measured?

Yes, the cross-section area of an E-M wave can be measured using specialized equipment such as antennas or receivers. These devices can detect and measure the strength of the E-M wave, which can then be used to calculate the cross-section area.

## 5. Is the cross-section area of an E-M wave constant for all types of waves?

No, the cross-section area of an E-M wave can vary depending on the type of wave. For example, a plane wave will have a constant cross-section area, while a spherical wave will have a varying cross-section area that decreases with distance from the source.

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