The atomic mass unit is defined as
A)
the mass of a proton.
B)
the mass of a neutron.
C)
the mass of an electron.
D)
the mass of a hydrogen-1 atom.
E)
one twelfth the mass of a carbon-12 atom.
E
You might also like to view...
How does the spectrum of a molecule differ from the spectrum of an atom?
A) A molecule does not have spectral lines due to electrons changing energy levels. B) A molecule has additional spectral lines due to changes in its rotational and vibrational energies. C) Molecules only have spectral lines at ultraviolet wavelengths. D) Most atoms only have spectral lines at infrared wavelengths. E) An atom has a wider range of spectral lines than molecules.
A solar cell has a light-gathering area of 10 cm2 and produces 0.30 A at 0.80 V (DC) when illuminated with sunlight of intensity 1000 W/m2 . What is the efficiency of the solar cell?
a. 16% c. 7% b. 4% d. 24%
White dwarfs were once the cores of stars that produced planetary nebulae
Indicate whether the statement is true or false
A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is
A) 8 J. B) 20 J. C) 60 J. D) 80 J. E) none of the above