When did the quaternary period occur?
What will be an ideal response?
2.58 million years ago
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The quark structure of the proton is uud
a. True b. False Indicate whether the statement is true or false
If the energy for the ground state level (n = 1) of hydrogen is ?13.6 eV, which of the following gives an approximate value for the energy of an electron of the K shell (n = 1) of the element beryllium for which the atomic number = 4?
a. –122 eV b. –40.8 eV c. –218 eV d. –54.4 eV e. –40.8 eV
A light ray can pass through a diverging lens without being deflected
a. True b. False Indicate whether the statement is true or false
A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
what is its coefficient of performance under these conditions?
A. 3.7 B. 1.1 C. 2.0 D. 4.2