- #1
Raghav Gupta
- 1,011
- 76
How high frequency makes waves dangerous for us.also does all em waves have same speed of light?
100% approval, there.Drakkith said:To bounce off of what Sophie said, EM waves have their energy divided into "quanta", little packets of energy that they interact with matter through. The higher the frequency, the larger this packet of energy is. Once the frequency of the wave becomes high enough, about the UV range and higher, eat packet contains enough energy to knock electrons completely out of their atom and molecules. Removing an electron is called ionization and leaves behind two highly reactive particles, the electron and the atom/molecule, which can then react with other atoms/molecules in your body to cause damage.
Raghav Gupta said:Well I have read in books that E=hv but can anyone explain proof or give experiment link for formula verification.
@Drakkith Bad boy, naughty boy. Your spelling is all to hell!Raghav Gupta said:Sophie Sir 99.9% approval must be there to what Drakkith Sir has said.As you will carefully notice post there is "eat packet".Well I have read in books that E=hv but can anyone explain proof or give experiment link for formula verification.Also how does speed of em waves change when not in vacuum?
As you don't want a Maths based answer, ( and I can't blame you at this stage!) I could suggest that you look at it this way. As an EM wave propagates through a substance that is an insulator (metals are not included in this simple example), the Fields in the EM wave will have an effect on the charged particles in the material. This will be the electrons for all but the highest frequency waves. You could imagine the electrons moving slightly, 'in synchronism with the fields in the wave. As they move, they will re radiate a wave at the same frequency as the incident wave but there will be a delay. So that will have the effect of increasing the time taken for the energy to get through the substance i.e. the speed of the wave.Raghav Gupta said:Thanks Drakkith sir for providing me with proof and experiment link although I am not so acquainted with all those partial derivatives and proof stuff and it all looks hi-fi at the moment.Will look in future to all these by gathering enough basic information.
Can anyone answer my second question that how EM waves speed changes when not in vacuum,that is not speed of light?
It looks like both you Sophie Sir(though your boat name is Sophie) and Drakkith Sir have deep knowledge in this subject.I got it all by explaining in simple manner.sophiecentaur said:As an EM wave propagates through a substance that is an insulator (metals are not included in this simple example), the Fields in the EM wave will have an effect on the charged particles in the material. This will be the electrons for all but the highest frequency waves. You could imagine the electrons moving slightly, 'in synchronism with the fields in the wave. As they move, they will re radiate a wave at the same frequency as the incident wave but there will be a delay. So that will have the effect of increasing the time taken for the energy to get through the substance i.e. the speed of the wave.
The amount that the wave is slowed down will depend upon the number of electrons it encounters on the way through so you would expect the more dense substances to slow the waves more than the less dense. Air makes very little difference at all but water and glass will have a very significant effect on the speed.
Many (most) dense substances will tend to absorb the energy as it passes through so they tend not to be 'transparent'.
Higher frequency EM waves have more energy than lower frequency waves. This means that they can cause more damage to living tissue when absorbed. The higher the frequency, the more energy an EM wave has, and thus the more potential for harm.
Exposure to higher frequency EM waves can potentially lead to tissue damage and heating of the body's cells. This can cause a variety of health issues, including skin burns, eye damage, and even DNA damage. Additionally, prolonged exposure to high frequency EM waves has been linked to an increased risk of cancer.
The level of danger associated with high frequency EM waves can vary depending on the source. For example, exposure to high frequency EM waves from natural sources, such as the sun, is generally less harmful than exposure to man-made sources, such as cell phones and Wi-Fi routers. However, the amount of exposure and the distance from the source also play a significant role in determining the level of danger.
Yes, there are several safety measures that can be taken to reduce the potential harm from high frequency EM waves. These include limiting the amount of time spent near high frequency sources, using protective barriers or clothing, and using devices with lower frequencies when possible. It is also important to follow safety guidelines and regulations set by organizations such as the FCC.
The general public can protect themselves from potential dangers of high frequency EM waves by staying informed about the sources of these waves and taking necessary precautions. This includes limiting exposure, using protective measures, and following safety guidelines. It is also important to educate oneself on the potential risks and make informed decisions about the use of devices that emit high frequency EM waves.