# What does the speed of an electromagnetic wave depend on?

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Electromagnetic waves, like any wave, have a finite speed value which is dependent upon the properties of the medium through which it flows. … The speed of a wave is independent of its frequency and wavelength. A change in the frequency value will not result in a change in the speed value.

## What determines the speed of an electromagnetic wave?

The speed of a wave is a product of its wavelength and frequency. Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa. This relationship is represented by the equation: Speed = Wavelength × Frequency.23 мая 2019 г.

## What affects the speed of an electromagnetic wave?

The actual speed of an electromagnetic wave through a material medium is dependent upon the optical density of that medium. Different materials cause a different amount of delay due to the absorption and reemission process.

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## Do electromagnetic waves change speed?

Electromagnetic waves travel more slowly through a medium, and their speed may vary from one medium to another. For example, light travels more slowly through water than it does through air (see Figure below).

## At what speed do electromagnetic waves travel in a vacuum?

Generally speaking, we say that light travels in waves, and all electromagnetic radiation travels at the same speed which is about 3.0 * 108 meters per second through a vacuum.

## Why electromagnetic wave can travel in vacuum?

An EM wave can travel without a material medium—that is, in a vacuum or space empty of matter—and does not lose energy as it moves. In theory, an EM wave can travel forever. Because they do not need a medium, EM waves can pass through outer space, which is a near vacuum.

## Which light travels the fastest speed?

Which type of light travels the fastest through a vacuum? 1. gamma rays 2. visible light 3. None…

• Gamma rays.
• Visible light.
• None of these; they all travel at the same speed.
• X-rays.

## What is the most important source of electromagnetic waves on earth?

The most important source of electromagnetic waves on Earth is the sun. Electromagnetic waves travel from the sun to Earth across space and provide virtually all the energy that supports life on our planet.

## Why does all light travel at the same speed?

and one very important one that varies: its energy. … Through the vacuum of space, no matter what their energy is, they always travel at the speed of light. It doesn’t matter how quickly you chase after or run towards light, either; that speed you view it traveling at will always be the same.

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## Do electromagnetic waves need a medium?

These changing fields form electromagnetic waves. Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

## How safe are electromagnetic waves?

There is no doubt that short-term exposure to very high levels of electromagnetic fields can be harmful to health. … Despite extensive research, to date there is no evidence to conclude that exposure to low level electromagnetic fields is harmful to human health.

## At what speed do radio waves travel?

approximately 186,000 miles per second

## Which type of waves travel the fastest?

This is the fastest kind of seismic wave, and, consequently, the first to ‘arrive’ at a seismic station. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth. It pushes and pulls the rock it moves through just like sound waves push and pull the air.

## Which is faster infrared or microwave?

Infrared rays are less controlled as compared to microwave radiation, which is more specified. The wavelength of infrared is shorter than that of microwave radiation, which falls in between radio waves and infrared on the electromagnetic spectrum. This means infrared rays have a higher frequency than microwaves.2 мая 2018 г.

Gamma rays