Choose the methods of wave propagation

• Satellite propagation

• Ground wave Propagation

• Ionospheric propagation

• Space wave propagation

Lower frequency signals are transmitted as

• Space waves

• Sky waves

• Ground waves

Why do low frequency waves are transmitted as Ground waves?

• Attenuation is high

• Energy of the waves are high

• Attenuation is low

• Lower amount of short circuiting

The highest amount of ionization happens in

• The layer closest to the earth

• The middle layer

• The layer closest to the sun

• All above

You may get to listen to a radio channel broadcasted in India at night but not in the day. The reason could be,

• Higher amount of ionization during the day and lower amount of ionization at night

• Lower amount of ionization during the day and higher amount of ionization at night

• The bending of the signal in the ionosphere is lower at night hence, can be received at a higher distance

• High amount of cosmic rays are received during the day, thus increasing ionization

When the angle of radiaition decreases, the skip distance

• increases

• Decreases

How long an EM wave radiated from a 45 m tower can travel. Earth Radius - 6400km

• 240km

• 24km

• 2400m

• 2400km

According to ITU the frequency range from -------- belongs to the radio spectrum

• 3-3000 GHz

• 3MHz-3000GHz

• 3kHz-3000 GHz

• 3Hz-3000GHz

Frequencies below ------ are transmitted as ground waves

• 200MHz

• 20GHz

• 20kHz

• 2MHz

The EM waves with frequencies in the range ----- are transmitted as sky waves

• 2-500MHz

• 2-30MHz

• 2-90MHz

• 2-70MHz