Physics
Beta rays emitted by a radioactive material are

Neutral particles
Electromagnetic radiations
Charged particles emitted by nucleus
The electrons orbiting around the nucleus

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

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

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