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

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

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
In white light, the blue component dominates
It is actually blue
All colours interfere to produce blue

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