Which of the following statements regarding the Doppler effect is NOT true based on its diverse applications?
1
The Doppler effect is utilized in military applications to detect enemy aircraft.
2
Doctors use the Doppler effect in sonography to study heart beats and blood flow.
3
The Doppler effect is solely applicable to sound waves and not electromagnetic waves.
4
Airports employ the Doppler effect to guide aircraft during landing and takeoff procedures.