# Do electromagnetic waves travel forever?

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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.

## Do waves lose energy as they travel?

Sound wave theory 09. … As it travels, a sound wave’s energy is slowly lost as heat. This happens because the molecules of the medium through which it is travelling knock against each other as they transmit the sound wave energy.

## How far electromagnetic waves travel?

As to how far they can travel in a vacuum, the electromagnetic force reaches to infinity. Radio waves are part of the electromagnetic spectrum, so the answer is any distance you care to mention. I think the furthest yet detected by radio telescopes have travelled nearly 14 billion miles.

## Can light travel forever?

Light travels forever until it is absorbed. However, if it travels a very long way indeed, it is redshifted by the expansion of the universe.

## How do waves travel indefinitely?

It depends on the medium through which the EM waves are travelling. In vacuum, the EM waves never lose energy, there is no attenuation in the amplitude of the waves and thus they keep travelling infinitely. But in conducting medium, an exponential decay in the amplitude occurs while the EM waves propagate.

## How far can ocean waves travel?

Waves in the oceans can travel thousands of kilometres before reaching land. Wind waves on Earth range in size from small ripples, to waves over 30 m (100 ft) high, being limited by wind speed, duration, fetch, and water depth.

## Why electromagnetic waves Cannot travel long distances?

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.

## Is WIFI an electromagnetic wave?

Wifi waves travel through space as rapid, data encoded pulses or waves. … This frequency band means that wifi boxes and computers can send and receive data as electromagnetic wave that have a 3 to 5 inch distance distance between each pulse of the wave.

## How long radio signal can travel?

Radio waves have the longest wavelengths in the EM spectrum, according to NASA, ranging from about 0.04 inches (1 millimeter) to more than 62 miles (100 kilometers).

## Why does light not go on forever?

Light is made up of particles called photons that travel like waves. … Unlike some types of particles, they do not decay, meaning that they do not spontaneously turn into other types of particles. With nothing to stop them and no chance of decaying, the will keep going forever.

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## Why is space dark?

Because space is a near-perfect vacuum — meaning it has exceedingly few particles — there’s virtually nothing in the space between stars and planets to scatter light to our eyes. And with no light reaching the eyes, they see black.

## Can anything go faster than light?

No. The universal speed limit, which we commonly call the speed of light, is fundamental to the way the universe works. … Therefore, this tells us that nothing can ever go faster than the speed of light, for the simple reason that space and time do not actually exist beyond this point.

## Do sound waves last forever?

Due to that friction, the wave’s amplitude, or height, get smaller and smaller until it eventually dissipates. That is slowly fades out, due to friction in the air. Therefore, to answer the question, sound waves only have a limited amount of time to travel, but yes, in fact they do travel after being emitted.

## Do photons last forever?

Now, by studying ancient light radiated shortly after the big bang, a physicist has calculated the minimum lifetime of photons, showing that they must live for at least one billion billion years, if not forever. … The current experimental limit on the possible mass of the photon is 1054 kilogram.

## Can light be destroyed?

Light is an energy and energy neither be created nor be destroyed. It only change its form. It will converted from one energy form to another but never will be destroyed.