Physics
Ventilators are provided near the ceiling of the room because

These do not look nice in the lower part
These provide cross ventilation in the room
The exhaled warmer air rises up and goes out
These provide some sunlight in the room

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

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

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