How deep can radio waves penetrate water?
VLF radio waves (3–30 kHz) can penetrate seawater to a few tens of meters and a submarine at shallow depth can use them to communicate. A deeper vessel can use a buoy equipped with an antenna on a long cable.
Can radio waves affect weather?
They discovered that there is a correlation between temperature fluctuations in the upper atmosphere and the varying strength of the radio signals. The temperature fluctuations in the ionosphere have long been attributed to the proliferation of greenhouse gases on earth.
Does cold weather affect radio waves?
In conclusion, both temperature and humidity have an effect on the transmission of radio waves. Conclusion 1: The temperature is inversely proportional to the strength of radio waves, Conclusion 2: The relative humidity in the air is inversely proportional to the strength of radio waves.
Why is iPhone SAR so high?
Because the antennas are more powerful in iPhones. They will have better reception in remote areas(experienced myself compared to note 4). The SAR value does not matter because radio frequencies does not have an impact on our body since these radiations are non ionizing.
Which SAR value is dangerous?
According to US Federal Communications Commission (FCC), phones with a SAR level of 1.6 W/Kg for body or below are deemed safe. The same measurement is followed in India. In Europe, the government agencies require that the phone should have a SAR value of less than 2W/kg.
How can I check my SAR level?
To check for the SAR value, Dial *#07# USSD code in your mobile phone. 1.6W/Kg is the threshold value for the radiation level. If SAR value is less than 1.6 W/Kg, It is ok to use that phone. If SAR values exceeds this threshold limit, consider take necessary steps to avoid radiation affects.
What is the limit of mobile radiation?
The parameter used to measure the radiation emitted by cell phones is the specific absorption rate (SAR) given in units of Watts of power absorbed per kilogram of tissue (W/kg). The permissible upper limit for cell phones set by the U.S. Federal Communications Commission (FCC) is 1.6 W/kg of RF radiation.
What is head vs body SAR?
SAR is measured for placement of the phone next to the head and on the body. For example, the iPhone 6 has a Body SAR of 1.14 W/kg and Head SAR of 1.08 W/kg.
How does SAR value affect the body?
SAR values increase as the conductivities of human body tissues increase and usually decrease as the increase of relative permittivities of human body tissues increase. The effect of the dielectric values of human body on SAR is orientation, human body and frequency dependent.