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Due to Doppler effect an apparent increase in the transmitted frequency will occur when:
  • A
    There is no relative movement between the transmitter and the receiver.
  • B
    The transmitter and receiver move towards each other.
  • C
    The receiver moves away from the transmitter.
  • D
    The transmitter moves away from the receiver.
Refer to figure.
The doppler effect is also known as doppler shift. The doppler effect is being described as the change in frequency of a wave in relation to an observer who is moving relative to the wave source. Doppler effect is created by the source of the waves that moves closer to the observer.

Each new radio wave that is being transmitted moves a position closer to the observer and each new wave takes slightly shorter to reach the observer. The distance between the radio waves between observer and transmitter decreases which causes an increase in the frequency, as seen in the figure.

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