Physics
Beta rays emitted by a radioactive material are

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

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The silver piece will weigh more
The gold piece will weigh more
Both silver and gold pieces weigh equal
Weighing will depend on their masses

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