A) When variable frequency a.c. Source is connected to a capacitor, displacement current increases with increase in frequency
B) As frequency increases conduction current also increases
C) Short wave bands are used for transmission of radio waves to a large distance
D) Ultraviolet radiation are absorbed by the atmosphere and converts Ozone to Oxygen
Correct Answer: D
Solution :
[d] Short wave (wavelength 30 km to 30 cm). These waves are used for radio transmission and for general communication purpose to a longer distance from ionosphere. The wavelength of these wave ranges between \[4000\text{ }\overset{o}{\mathop{A}}\,\] to \[100\text{ }\overset{o}{\mathop{A}}\,\] that is smaller wavelength and higher frequency. They are absorbed by atmosphere and convert oxygen into ozone. They cause skin diseases and they are harmful to eye and cause permanent blindness.
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