Card layouts and slide shows add content to a home page without creating clutter.
Answer the following statement true (T) or false (F)
True
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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
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
Water held tightly to sediment grains is called
What will be an ideal response?
According to the present estimates, the Universe is about ________ years old.
A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109