DOPPLER

#2. An aeroplane is flying at 486 kt directly towards a beacon transmitting on a frequency of 12 GHz. The change in frequency observed will be:

• A10 MHz
• B6.25 Hz
• C10 kHz
• D6.25 kHz

#1. Doppler operates on the principle that ...... between a transmitter and receiver will cause the received frequency to ...... if the transmitter and receiver are moving ..... .

• Aapparent motion, decrease, together
• Brelative motion, decrease, apart
• Cthe distance, increase, at the same speed
• Drelative motion, increase, apart

#3. Due to ‘Doppler' effect an apparent decrease in the transmitted frequency, which is proportional to the transmitter's velocity, will occur when:

• Athe transmitter and receiver move towards each other
• Bthe transmitter moves away from the receiver
• Cthe transmitter moves towards the receiver
• Dboth transmitter and receiver move away from each other