Physics
A doppler effect occurs when a source of sound moves

Towards you
Away from you
None of these
Both A & B

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not require a medium to propagate.

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