The Universe Contains About 10 Times as Many Hydrogen Atoms

question 71

Multiple Choice

The universe contains about 10 times as many hydrogen atoms as helium atoms, but a helium atom has 4 times the mass of a hydrogen atom. What is the approximate ratio of the universe's hydrogen to helium by mass?

• A) 2.5 to 1
• B) 10 to 1
• C) 4 to 1
• D) 1 to 4

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A network of neurons located in the brainstem that is involved in controlling arousal and consciousness.

Electroencephalogram

A test that detects electrical activity in the brain using small, metal discs attached to the scalp, often used in the diagnosis and monitoring of neurological conditions.

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Energy derived from electric potential or kinetic energy, which is commonly used for power generation and distribution in households and industries.

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