Question
Physics Question on communication systems
For transmission of e.m.wave of audible frequency, these waves are superimposed with waves of
A
frequency less than 20 Hz
B
frequency between 20 Hz and 10 KHz
C
frequency in the audible range
D
radio-frequency
Answer
radio-frequency
Explanation
Solution
Since radio frequency waves can travel long distances because these waves are of wave length of the order of 100 m and their energy content is quite large therefore e.m.wave of audible frequency are superimposed with radio frequency waves.