An alpha particle is equivalent to the nucleus of an atom of which element?(1 point) carbon
carbon

helium
helium

nitrogen
nitrogen

hydrogen

   An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom. Alpha particles (also termed alpha radiation or alpha rays) was the first nuclear radiation to be discovered, beta particles and gamma rays were identified soon after.

Explanation:

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

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