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Answer the following statement true (T) or false (F)


True

Physics & Space Science

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According to the present estimates, the Universe is about ________ years old.

A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109

Physics & Space Science

A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?

A) 8 hours B) 6 hours C) 4 hours D) 2 hours E) none of the above

Physics & Space Science

An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. Selecting the longest wavelength that will work from the those given below, what wavelength is needed if a photon accomplishes this task?

a. 60 nm b. 80 nm c. 70 nm d. 90 nm e. 40 nm

Physics & Space Science

Water held tightly to sediment grains is called

What will be an ideal response?

Physics & Space Science