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Radio waves are a type of electromagnetic radiation, generated by charged particles which are continuously accelerating. These waves can travel through air and space at the speed of light, but they have trouble penetrating some materials, such as metals and water.
Radio waves with frequency range above 30 MHz can only travel for short distances (However, radio waves at frequencies above 30 MHz can still travel significant distances through the atmosphere and can be used for long-range communications under appropriate conditions). While radio waves having frequency range below 30 MHz may travel long distances through water. Lower frequency radio waves have longer wavelengths, which means they interact less with water molecules than high frequency radio waves. In high frequency radio waves, the amount of attenuation (loss of signal strength) will be much more than a lower frequency wave. This is because radio waves are affected by free electrons. Water is a weak conductor of electricity but when radio waves enter into water, they induce electric current in the water molecules, which dissipate some of the energy of the waves. Salt water absorbs radio waves more than fresh water because it is more conductive than fresh water. Also salt water has a high dielectric constant as a result interacts more strongly with the electric field of radio waves.
One more problem for establishing radio communication between underwater vehicles is that radio waves can also be reflected by water surfaces. While some researchers have developed novel systems that use sonar signals to cause vibrations on the water surface that can be decoded by airborne receivers, these are still in their early stages.
Radio wave behavior is a complex topic influenced by various factors, and its interaction with different materials and environments can have diverse outcomes.
For more details about EM waves please explore the given video :
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Recent posts
All categories
- CBSE (4)
- JEE Main (2)
- NEET (5)
- IBPS PO/CLERK (PRE) (3)
- Bank MAINS Exams (1)
- IBPS PO/CLERK (PRE + MAINS) (3)
- SBI PO/CLERK (PRE) (4)
- Aptitude (2)
- Class 9 to 12 (1)
- Industrial Courses (1)
- Blog (169)
- Current Affair (4)
- Class 6 (1)
- IBPS RRB PO/CLERK (PRE) (1)
- IBPS RRB Office Assistant (1)
- Class 8 (1)
- Class 9 (2)
- Class 10 (3)
- Class 11 (2)
- Class 12 (3)
- IIT-JEE (2)
- SSC - CGL (11)
- SSC - CHSL (4)
- NDA (3)
- SSC - MTS (8)
- Lekhpal (2)
- NTSE SAT (1)
- KVPY (1)
- Job Oriented Courses (3)
- EDP Courses (1)
- Government Scheme (6)
- IBPS RRB PO/CLERK (PRE + MAINS) (2)
- SBI PO/CLERK (PRE + MAINS) (2)
- UPSSSC PET (2)
- NTPC CBT - 1 & 2 (1)
- SSC - GD (2)
- CDS (3)
- Gate (1)