Good question

As a radiation Safety Officer for 34 years one of those quirky observations

Ants wont cross a radiation line from wireless exiting the ground, nor will grass grow. If its a new radiation line everything goes yellow and dies and eventually becomes clear earth , if the radiation persists.

What we first thought was animal roadways of clear dirt, turns out to be radiation hot spots, as in wireless type radiation exiting.

I’ve used different machines but you can rent one from your power company, like a galvanometer and get the nuclear detection one as they are even more sensitive, but any will do, tracking radiation is a personal thing for your own comfort, and it changes thru the day and night as band with, frequency and duration change depending on the producer and the user of the radiation.

And these exiting spots can change with ground moisture, fire, and earthworks by machines, not much by animals.

Wireless radiation gives my wife a buzz, Migraine sufferers are very sensitive to wireless radiation earthing systems or dysfunction, many are not connected to any standard unless complaints are made. Me I now feel it behind the eye balls, it took a while to focus, but Im getting better at it over the decades.

Diviners are brilliant at finding it.

For animals you can watch radiation lines on time sensitive photography along Grids, how animals walk down the sides of the line.

I do a lot of search and rescue over the decades and people follow certain effect, not to mention how your compass reacts to wireless radiation entering or leaving the ground your standing on.

On the weekend I was watching a peacock walk around a SWR power pole avoiding something, if it stepped wrong, it would step back and tread lightly, but once free of the radiation it pecked more freely.

Most wild birds avoid power lines in my farming area, but sulphur crested cockatoos like to do acrobats and blow the power and themselves all over my driveway and turns the freezer off, a real pain during the breeding season. They are immune to the radiation, like crows and magpies and some pigeons

Moths and butterflies react to it.

All animals like wire fences to hang around and roost over, good earthing of radiation

Radiation. A word that causes a mental alarm to go off. Alert! Alert! Radiation! Danger!

Most people have a poor understanding of what Radiation, alebit Electromagnetic, truly is.

Perhaps the fear stems from Madam Curie's death from radiation poisoning or maybe nuclear radiation corrupting the very land of it's origin. This stigma associated with Radiation causes a lot of misinformed/uninformed populace to fear Radiation from Mobile Phones, Microwaves, et al.

Let us take a moment to truly get a sense of what Electromagnetic Radiation (EMR) is. EMR is a form of energy released from a source due to several possible reasons. This energy travels in the form of waves at the speed of light. The EMR Spectrum consists of, in the ascending order of frequency.

• Radio Waves
• Micro Waves
• Infrared Waves
• Visible Light
• Ultraviolet Rays
• X Rays
• Gamma Rays

The frequency of the EMR corresponds to how much energy it carries. Of these forms of radiation, UV, X & Gamma Rays carry enough energy to damege the Cellular DNA and cause complications like Mutations, Cell Damage & in some cases Cancer. These rays however, have a lot of medical & scientific applications.

Getting back to Phones, they only use low frequency Radio waves. These waves pass through our bodies whilst causing no harm, due to their low energy. The only thing I'd however be concerned about phones is not their radiation (which is safe & harmless), but rather how we get addicted to our phones.

TLDR; Electromagnetic Radiation, only in the form of UV, X & Gamma rays are harmful to cells. The rest of the spectrum does no cellular damage.

Who said birds can't evolve to resist radiation?

According to lead author Dr Ismael Galván of the Spanish National Research Council (CSIC): "Previous studies of wildlife at Chernobyl showed that chronic radiation exposure depleted antioxidants and increased oxidative damage. We found the opposite -- that antioxidant levels increased and oxidative stress decreased with increasing background radiation."

The Chernobyl disaster, which occurred on April 26 1986, had catastrophic environmental consequences. However, because it remains heavily contaminated by radiation, the region represents an accidental ecological experiment to study the effects of ionizing radiation on wild animals.

Laboratory experiments have shown that humans and other animals can adapt to radiation, and that prolonged exposure to low doses of radiation increases organisms' resistance to larger, subsequent doses. This adaptation, however, has never been seen outside the laboratory in wild populations.

Previous studies of the level of antioxidants and oxidative damage at Chernobyl are limited to humans, two bird species and one species of fish. Because different species vary widely in their susceptibility to radiation, this limited data has made it difficult to study how wild animals adapt to radiation exposure.

The researchers, including ecologists who have worked around Chernobyl since the 1990s, used mist nets to capture 152 birds from 16 different species at eight sites inside and close to the Chernobyl Exclusion Zone. They measured background radiation levels at each site, and took feather and blood samples before releasing the birds.

Nature is parsimonious. This means that the minimum resources are spent to achieve any result, and that nature doesn’t commit resources unless the benefits overweigh the investment required. As a consequence, birds (or any other organism) will evolve a feature such as radiation resistance only when such resistance gives them an advantage over non-radiation resistant species. This also means that you would expect to see such a trait only where radiation levels in the environment are high enough to make this mutation confer a significant reproductive advantage to the birds with the mutation.

Of course, there is always the chance of some organisms developing this capability as a coincidental side-benefit of some other mutation that does have immediate survival & reproductive benefits, but this chance is small.

When you did your last dental X-ray, did they cover you with some protection apron like this?

This is because X-ray is some form of electromagnetic radiation. If it would 100% harmless then of cause no-one would spend money purchasing them.

Radiation exposure from dental X-ray is very tiny, and still dentists covering patient body to decrease the unnecessary exposure.

Specific frequencies of electromagnetic radiation are constantly affecting animals.

1. Some animals sometimes actively avoid being exposed to some frequencies (measured in a wavelength of on the order of one micrometer) while at other tines seek that out..
2. An enormous number of animals change their behavior when irradiated by a very small range of frequencies, about one octave in musical terms, in the fraction of a micrometer range. In fact much of their behavior is actually controlled by this radiation.
3. Virtually all animals, all life actually, goes into a special condition when exposed to large amounts of a different set of frequencies, with wavelength of a billionth or a trillionth of a meter. That condition is commonly called “dead”.

Note: #1 is heat from the sitting in the sun, infrared, #2 is visible light, #3 is short wave UV and gamma radiation.

Electromagnetic radiation is associated with those EM waves that are free to propagate themselves radiate without the continuing influence of the moving charges that produced them, because they have achieved sufficient distance from those charges.

Q: Does electromagnetic radiation ever become undetectable?

Theoretically, no. With a sensitive enough detector, you could theoretically detect any electromagnetic radiation from even billions of light years away. Which is why, of course, we are able to detect the light of extremely distant galaxies using sensitive telescopes such as the Hubble Space Telescope.

From a practical standpoint, however, it really depends on the intensity of the electromagnetic radiation. The intensity of all electromagnetic radiation (including light) decreases with distance in proportion to the square of the distance between emitter and receiver (a ratio referred to as the Inverse Square Law). So, for example, it there are two light sources that produce equal intensity of light, one that is twice as far away from you as the other will appear to be one-quarter as bright instead of merely one-half. And if one is three times as far away it will appear to be only one-ninth as bright instead of merely one-third.

So, what does this mean? Well, if the light source is as bright as an average star, it will be detectable even if 10,000 light years away with the naked eye and nearly 900,000 times that distance (9 billion light years away) with a sensitive instrument such as the Hubble Space Telescope. And galaxies are so bright that they can be seen with the naked eye even when 2.5 million light years away (such as the Andromeda galaxy) and much, much further away when viewed with the Hubble Space Telescope. And there are plenty of other EM sources out there that emit incredibly intense amounts of radiation (including radio waves) that can be detected from one end of the known universe to the other.

However, if you’re talking about the sorts of electromagnetic radiation that we are able to produce ourselves here on Earth (or that some other alien civilizations would likely be able to produce), whether it be flashlight beams, lasers, radio and television transmissions, etc., the operation of the inverse square laws means that any such emissions would cease to be detectable in relatively short order, even with extremely sensitive equipment. I can’t provide an exact distance, since it all depends on the sensitivity of the hypothetical equipment in question, but let’s just say that the idea of some distant alien civilization picking up broadcasts of old “I Love Lucy” episodes and deciding to come for a visit to express their admiration belongs firmly in the realm of science fiction and not science fact.

Electromagnetic radiation is emitted when something causes disturbance in electromagnetic field of the vacuum. A unit disturbance in electromagnetic field propagates in all directions at the speed of light “c”. This unit disturbance is also known as Photon. The radiation fills space in all directions with an area approximating the surface area of a sphere of radius r, where r is the distance traveled by radiation.

A time varying electric field creates a time varying magnetic field, which in turn generates a time varying electric field and so on. Thus it is the disturbance in electromagnetic field of vacuum which actually moves at c and not the electric or magnetic field itself.

According to Field theory, electromagnetic field permeates throughout the Universe, and therefore it is omnipresent. We can visualise electromagnetic field as point vectors in space. Just as each point of the surface of a moving fluid can be visualised as a velocity or displacement field. We can use equations of fluid dynamics to describe properties of electromagnetic field.

Please point out mistakes, if any, in comments section. Comments are welcome.

Electric and magnetic fields contain energy. The energy density of an electromagnetic field is:

With electromagnetic radiation, the electric and magnetic fields (along with the energy they contain) propagate at the speed of light.

There’s something called the “Poynting vector” which represents the power per unit area being transmitted by electromagnetic radiation (as well as the direction of transmission, since it’s a vector). I’m fairly certain the Poynting vector is the quantity you’re asking about. (Poynting vector - Wikipedia.)

Many different things.

The main thing is that it allows life as we know it to exist. Sunlight is used as an energy source for nearly all forms of life including plants. Without plants there would be no animals.

Gamma rays from natural radioactive substances and cosmic sources may have played a role in creating more mutations, thus helping evolution.

Light, including near infrared and near ultraviolet is used for vision by many animals.

Ultraviolet in the range 100–280 nm allows humans and some other animals to sythesise vitamin D. It also kills viruses, reducing airborne viral infections.

Infrared radiation conveys much of the Sun’s energy to the Earth.

Longer wavelength EM radiation has no known effect on life apart from heating.

At first, all of those below, they are all electromagnetic radiations. They hold both electric and magnetic constituent.

• “Pay attention in this picture in which temperature, which electromagnetic waves are most intense.”

So how they become existence?

If an electron makes an accelerated motion, the energy it has to spread over while it is decelerating the first stage is spreading as electromagnetic waves.

And I acutely recommend you to watch this video.

Depends on the wavelength. Radio will have little effect, microwave of the wavelength used (which is strongly absorbed by water will cook you (don’t use an oven with a damaged door), infrared will heat you up (nice if not overdone), visible allows us to see (but don’t look directly at the sun), uv can damage your skin and cause cancer (stay out of tanning beds), x-ray and gamma rays can cause ionization and damage your cells, but can kill cancer.

The stray radiation from cell phones and the 60-cycle current has little to no effect. If you want to avoid risk better to worry about real problems — pollution, viruses and bacteria, car accidents, gun violence, global warming, etc.

There’s plenty to worry about w/o making up shit and preventive measures are more effective if aimed at significant problems.

It is the single greatest source of information we have about the outside world. By outside world I mean the screen of this smartphone that I am tapping on, the tense face of my roommate while he plays video games and the stars Altair, Deneb and Vega that I observed earlier tonight in astronomy lab.

Visible light is only one kind of electromagnetic radiation. It is responsible for everything that we see. There are other frequencies of electromagnetic radiation as well. I need only mention radio waves which allow you watch the final season of Game of Thrones from the comfort of your couch and lets astronomers study these fascinating objects called pulsars.