The radius of the Earth is 6,380,000 m at the equator. Give the radius of the earth in scientific notation.
A. 638 × 104 m
B. 6380 × 103 m
C. 6.38 × 106 m
D. 0.638 × 107 m
C. 6.38 × 106 m
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Which of the following is the correct electron dot structure for chlorine (atomic no. = 17)?
A) a B) b C) c D) d E) e
What is the reason a type I supernova slows its dimming after about 2 months?
A) The planetary nebula cooled enough to form a dust shell. B) Energy is released from the decay of radioactive cobalt 56 to iron 56. C) The supernova remnant suddenly becomes transparent. D) The burst of energy carried by neutrinos is finally observed. E) Energy from the supernova's shock wave is released as it hits interstellar matter.
Motion combines the concepts of position
change (length) and time. Which of the following combination of units is used to describe the velocity of a moving object? a)length/time b)length x time c)time/length d)Length/time2
According to the selection rules, which of the following transitions is not allowed?
A) n = 3, ? = 2 to n = 2, ? = 1 B) n = 4, ? = 3 to n = 3, ? = 2 C) n = 3, ? = 1 to n = 1, ? = 0 D) n = 2, ? = 1 to n = 1, ? = 0 E) n = 4, ? = 2 to n = 3, ? = 2