Which of the following is true about EM waves? i Exposure to radio waves, microwaves, infrared rays and visible light are not as dangerous compared to the exposure to UV rays, X-rays and gamma rays. Gamma radiations are very strong and considered to be the most dangerous because they can penetrate even thick concrete and lead iii. UV rays are used to check the signature on pass book. iv. Visible light rays can be used in optical fibers in medical uses, screen of electronic devices, artificial lighting and in photosynthesis

b. i, ii, only
a. i only
c. i, iii, iv only
d. iii, iv only

Openness to exceptionally high RF powers can bring about warming of organic tissue and an expansion in internal heat level. Tissue harm in people could happen during openness to high RF levels on account of the body's powerlessness to adapt to or disseminate the inordinate hotness that could be created. Radio waves are a sort of electromagnetic radiation with wavelengths in the electromagnetic range longer than infrared radiation. Radio waves comprise of the longest wavelength electromagnetic waves, normally with frequencies 300 gigahertz (GHz) and beneath.

You know your CB Radios uses radio waves to send and get transmissions through a recieving wire snared through the handset. What you probably won't know is who found radio waves. Or on the other hand, what sort of wave it is. Or on the other hand, what they can go through and what stops them.

Albeit some of you probably won't really mind, others are interested with regards to this science. Generally speaking, assuming radio waves were never found then the world would be a very different spot. Thus, to control your interest, the following are five fascinating realities about radio waves.

what is radio waves?:

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