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.

Physics & Space Science

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Which of the following is considered anitmatter?

a. u b. e– c. e+ d. d

Physics & Space Science

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

Physics & Space Science

Which of the following planets has a stratosphere?

A) Mercury B) Venus C) Earth D) Mars E) all of the above

Physics & Space Science

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.

Physics & Space Science