Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Should be made of a good conductor but can be of any shape
Can be of any shape
Should be in the form of a vertical rod

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Physics
X-rays region lies between

Ultraviolet and visible region
Visible and infra-red region
Short radio waves and long radio waves
Gamma-rays and ultraviolet region

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