Which of the following molecules is the most polar?
A) HCl
B) BrF
C) CO
D) Image
Answer: A
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When a low-mass star runs out of hydrogen in its core, it gets brighter. Why?
What will be an ideal response?
A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
a. 20 b. 30 c. 40 d. 10 e. 50
The rings of Neptune:
A) were confirmed by the Voyager 2 in 1989. B) number five, with three narrow, two more diffuse. C) all lie within Neptune's Roche Limit. D) often appear as clumpy ring arcs, rather than complete and symmetrical. E) All of these are correct.
What is the meaning of the solar constant?
A) the regularity of the 11-year sunspot cycle B) the amount of energy the Earth receives per unit area and unit time C) the stability of the Sun's luminosity for as long as life has existed on Earth D) the fact that features on the Sun appear to never change E) the fact that the amount of hydrogen turning into helium in the core is fixed