Chapter 39: Problem 23
(a) Using the Bohr model, calculate the speed of the electron in a hydrogen
atom in the
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Chapter 39: Problem 23
(a) Using the Bohr model, calculate the speed of the electron in a hydrogen
atom in the
These are the key concepts you need to understand to accurately answer the question.
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A certain atom has an energy state 3.50 eV above the ground state. When
excited to this state, the atom remains for 2.0
For your work in a mass spectrometry lab, you are investigating the absorption spectrum of one-electron ions. To maintain the atoms in an ionized state, you hold them at low density in an ion trap, a device that uses a configuration of electric fields to confine ions. The majority of the ions are in their ground state, so that is the initial state for the absorption transitions that you observe. (a) If the longest wavelength that you observe in the absorption spectrum is 13.56 nm, what is the atomic number Z for the ions? (b) What is the next shorter wavelength that the ions will absorb? (c) When one of the ions absorbs a photon of wavelength 6.78 nm, a free electron is produced. What is the kinetic energy (in electron volts) of the electron?
A 10.0-g marble is gently placed on a horizontal tabletop that is 1.75 m wide.
(a) What is the maximum uncertainty in the horizontal position of the marble?
(b) According to the Heisenberg uncertainty principle, what is the minimum
uncertainty in the horizontal velocity of the marble? (c) In light of your
answer to part (b), what is the longest time the marble could remain on the
table? Compare this time to the age of the universe, which is approximately 14
billion years. (
Photorefractive keratectomy (PRK) is a laser-based surgical procedure that
corrects near- and farsightedness by removing part of the lens of the eye to
change its curvature and hence focal length. This procedure can remove layers
0.25
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