List the four forces in order of their strength (weakest first). weak force stro

Question

List the four forces in order of their strength (weakest first).
weak force   

strong force

gravity   

electromagnetism

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The Universe is 75% Hydrogen and 25% Helium as these are the quantities produced through stellar nucleosynthesis.

True

False

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If the Universe were infinite, unchanging, and the same everywhere the sky would be always dark.

True

False

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Cepheids with longer periods have higher luminosities.

True

False

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What do astronomers need to measure the Hubble constant?

Colors and velocities.

Distances and velocities.

Masses and radii.

Distances and masses.

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What will happen if the Universe has a density higher than the "critical density"?

It will eventually stop expand and never collapse.

It will explode.

It will expand forever.

It will experience successive Big Bangs.

Colors and velocities.

Distances and velocities.

Masses and radii.

Distances and masses.

Explanation / Answer

1) Gravity(weakest), Weak, Electromagnetic, Strong force.
2) True
3) False
4) True
5) Distances and Velocities
6) It will eventually stop expand and never collapse.

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