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

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

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
The speed of the wave is zero or near zero
Two waves overlap

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