An atom with 5 electrons is in its ground state. How many electrons are in its outermost shell?
What will be an ideal response?
3
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The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs __________ radiation
Fill in the blank(s) with correct word
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thick-ness t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
An optical system comprises in turn, from left to right: an observer, a lens of focal length +30 cm, an erect object 20 mm high, and a convex mirror of radius 80 cm
The object is between the lens and the mirror, 20 cm from the lens and 50 cm from the mirror. The observer views the image that is formed first by reflection and then by refraction. What is the position of the final image, measured from the mirror? A) 90 cm B) 102 cm C) 114 cm D) 126 cm E) 138 cm
Interstellar absorption lines are narrow primarily because:
A) there is very little interstellar matter. B) molecules always produce narrow absorption lines. C) most of the matter is ionized, and atoms moving fast produce sharp lines. D) the matter is at a low temperature, and atoms are almost still. E) All of the above are correct.