Which statement is true about the use of the Doppler effect in a Doppler VOR?

Question

Answer

The Doppler effect is used to create a signal which is received by the aircraft's VOR-receiver as an amplitudemodulated sianal.

Answer

The Doppler effect is used to create a signal which is received by the aircraft's VOR-receiver as a frequencymodulated sianal.

Answer

By using the Doppler effect it is also possible to determine the aircraft's approach speed to the VOR.

Answer

By using the Doppler effect it is possible to determine the range of the aircraft from the VOR station moreaccurately.

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