Explanation
A mobile phone (or) cellular telephone is an example of a two – way radio that both transmit and receive at the same time. i.e. In full – duplex mode, Full – duplex may be achieved by the use of two different frequencues, to carry the two directions of the conversion simultaneously.
The ozone layer is a belt of naturally occuring ozone gas,that layer extends from 30 km to nearly 50 km above the earth and serves as a shield from the harmful ultravoilet β radiation emitted by the sun. Therfore, the range of ultravoilet radiation is 100 Å to 4000 Å . Thus blocks the radiation of wavelength less than 3 x 10-7 m (3000 Å)
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