Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat
It provides oxygen to a drowning person
The person can sit on it like a raft

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

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