Em Waves Question 144
Which of the following statements is correct.
Options:
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 is absorbed by the atmosphere and converts Oxygen to Ozone
Show Answer
Answer:
Correct Answer: D
Solution:
Short wave (wavelength 30 km to 30 cm). These waves are used for radio transmission and for general communication purposes to a longer distance via the ionosphere. The wavelength of these wave ranges between $ 4000\overset{o}{\mathop{A}}, $ to $ 100\overset{o}{\mathop{A}}, $ that is smaller wavelength and higher frequency. They are absorbed by atmosphere and can dissociate oxygen molecules. They cause skin diseases and they are harmful to eye and can cause permanent blindness.
BETA
