Which are the oldest solar system objects that have been dated radioactively? What are their ages?
What will be an ideal response?
The most important source for determining the age of the Solar System is meteorites. Radioactive dating of meteorites yields a range of ages, but there is a fairly precise upper limit— many meteorite samples have ages of 4.56 billion years old, and none are older. That figure is widely accepted as the age of the Solar System and is often rounded to 4.6 billion years. The true ages of Earth, the Moon, and Mars are also assumed to be 4.6 billion years, although no rocks from those bodies have yet been found that have remained unaltered for that entire stretch of time.
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Spectral Series: The Balmer series is formed by electron transitions in hydrogen that
A. end on the n = 1 shell. B. begin on the n = 1 shell. C. end on the n = 2 shell. D. begin on the n = 2 shell. E. are between the n = 1 and n = 3 shells.
A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
A. on all three. B. only on the book. C. only on the chair. D. upwards on the chair and downwards on the book. E. only on the objects that you have defined to be part of the system.
A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled?
A) It will be cut to one-quarter its original size. B) It will be cut in half. C) It will double. D) It will become four times as large. E) It will become eight times as large.
The energy level diagram for hydrogen
The ionization energy of hydrogen is 13.6 eV.
a.
True
b.
False