Physics
Which of these waves can be polarized ?

Light waves
Longitudinal waves on a string
Sound waves in air
Transverse waves on a string

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

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

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