We live in the epoch called the
a. Quaternary.
b. Ordovician.
c. Holocene.
d. Cenozoic.
c
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Helium production ceased when the universe was about ________ minutes old, and did not resume until the first generation of stars formed
Fill in the blank(s) with correct word
A heat island is annoying but not dangerous to health
What will be an ideal response?
A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 6000 kg/m3 . If the object contains equal masses of the materials, what is its average density?
a. 3000 kg/m3 c. 5000 kg/m3 b. 3200 kg/m3 d. more information is needed
Exclusion Principle: In its ground state, the quantum numbers (n, ?, m1, ms) for hydrogen are, respectively,
A. 1, 1, 1, 1. B. 1, 0, 0, 0. C. 1, 0, 0, ±1/2. D. 1, 1, 1, ±1/2.