Radio waves of constant amplitude can be generated with
Filter
Rectifier
FET
Oscillator
D.
Oscillator
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The process of superimposing signal frequency (i.e.,) audio wave on the carrier wave is known as
transmission
reception
modulation
detection
State various modes of propagation of electromagnetic waves. Explain briefly using a proper diagram, the mode of propagation used is the frequency range from a few MHz up to 40 MHz.
What is 'amplitude modulation'? Represent the process graphically. Write the limitation of amplitude modulation.
In an amplitude modulated wave for audio-frequency of 500 cycles/sec, the appropriate carrier frequency will be
