Physics
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

X-rays
ultraviolet light
radio waves
visible light

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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)

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

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