Physics
Which phenomena shows the particle nature of light?

Diffraction
Photoelectric effect
Polarisation
Interference

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically

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