What is the wavelength of a signal with a frequency of 150Mhz?

10m

20m

Correct Answer : 2m

Explanation : avionics

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The maximum peaks of an electromagnetic wave are separated by a distance of 8 in. What is the frequency?

256.4Khz

256.7Mhz

1477.8Khz

1477.8Mhz

Correct Answer : Option (D) : 1477.8Mhz

Explanation : Wavelength =8 in.= 0.203 m
Frequency = 300/0.203 = 1477.8Mhz.

SHF Em waves are used in?

Underwater communication

Satellite communication

Aircraft to ATC communication

Ground to ground communication

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.

Which one of the following is not a source of infrared radiation?

Sun

Books

Light bulbs

Human bodies

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.