Correct Answer : Less noise
Explanation : Although AM is much simpler and has a wider range due to atmospheric propagation, one of its major disadvantages is due to noise. Noise directly affects the amplitude of the signal and its hard to retrieve the original information.
Correct Answer : Option (D) : 1477.8Mhz
Explanation : Wavelength =8 in.= 0.203 mFrequency = 300/0.203 = 1477.8Mhz.
Correct Answer : Option (B) : Satellite communication
Explanation : SHFs or Super High Frequency EM waves are those which lie between the frequency range of 3 to 30GHz range. These microwaves frequencies are widely used in satellite communication and radar.
Correct Answer : Option (B) : Books
Explanation : Infrared radiation is generally associated with heat. Infrared is produced by light bulbs, human bodies, and basically any physical equipment that generates heat.