Excited atomic states that last for a relatively long time are called
A. laser states.
B. metastable states.
C. amplification states.
D. radiation states.
E. cascading states.
B. metastable states.
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Which of the following planets has a stratosphere?
A) Mercury B) Venus C) Earth D) Mars E) all of the above
Ancient philosophers and astronomers accepted without question-as first principles-that:
A) heavenly objects must move in circular paths at varying speeds.
B) the planets are made of rock and gas, much like Earth.
C) the Earth is motionless at the center of the Universe.
D) there are many galaxies in the Universe.
Which of the following is considered anitmatter?
a. u b. e– c. e+ d. d
A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop
a. 79 ?T b. 69 ?T c. 59 ?T d. 89 ?T e. 9.4 ?T