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Chapter 37: Q. 55 (page 1063)
A 5.4-cm-diameter cylinder has a length of 12.5 cm. What is the cylinder鈥檚 volume in SI units?
The volume of the cylinder is 2.86 x 10-4 m3.
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A cosmic ray travels through the earth鈥檚 atmosphere in, as measured by experimenters on the ground. How long does the journey take according to the cosmic ray?
Express in (or or if more appropriate):
a. The kinetic energy of a Li ++ ion that has accelerated from rest through a potential difference of .
b. The potential energy of two protons apart.
c. The kinetic energy, just before impact, of a ball dropped from a height of .
Two of the wavelengths emitted by a hydrogen atom are and.
a. What are the and values for each of these wavelengths?
b. For each of these wavelengths, is the light infrared, visible, or ultraviolet?
Once Thomson showed that atoms consist of very light negative electrons and a much more massive positive charge, why didn鈥檛 physicists immediately consider a solar-system model of electrons orbiting a positive nucleus? Why would physicists in object to such a model?
Write the symbol for an atom or ion with:
a. one electron, one proton, and two neutrons.
b. seven electrons, eight protons, and ten neutrons.
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