The primordial nucleosynthesis was sped up by the abundance of ________ in the universe once the temperature dropped below a billion K

A) helium-3 B) hydrogen C) deuterium D) tritium E) helium


C

Physics & Space Science

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What is the energy needed to change an He+ ion into an He++ ion? (The ionization energy of hydrogen is 13.6 eV)

a. 13.6 eV b. 54.4 eV c. 92.9 eV d. 112.4 eV

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A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed. The object falls with an acceleration of 4.00 m/s2 downward when it is falling downward at 70.0 m/s. What is its terminal speed?

A) 110 m/s B) 157 m/s C) 91.0 m/s D) 172 m/s E) 108 m/s

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The most harmful radiations are those that

A) kill living cells. B) damage living cells. C) don't encounter cells.

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The principal greenhouse gases are ______________ and ______________

Fill in the blank(s) with correct word

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