COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 26, Problem 104QAP
To determine
(a)
The energy of photon in eV.
To determine
(b)
The first three cathode-grid voltage when Frank-Hertz using Helium gas rather than Mercury vapor to see a drop in the anode current.
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•22 o Figure 40-23 is an energy-level
diagram for a fictitious infinite potential
E (/8ml*)
well that contains one electron. The num-
12
Non
ber of degenerate states of the levels are
indicated: "non" means nondegenerate
11
Triple
(which includes the ground state of the
electron), "double" means 2 states, and
"triple" means 3 states. We put a total of
Double
Triple
11 electrons in the well. If the electro-
Ground
static forces between the electrons can be
neglected, what multiple of h2/8mL? gives
the energy of the first excited state of the
11-electron system?
Figure 40-23
Problem 22.
(b) According to Bohr's atomic model, a one-electron system is described by the atomic number Z
and the speed vn of the electron at a radius m in the n-th quantum orbit:
Z.e²
1
h²
€0
Vn
=
2.h.Eon
rn
•N²
π
●
me e². Z
me
(i) Calculate the radius and the velocity for the first quantum orbit of the single ionised helium
atom.
(ii) Calculate the value for the velocity uncertainty, Avx, of the electron in the singly ionised
helium atom results, if a spatial uncertainty Ax of the electron is assumed to be the diameter
of the first quantum orbit.
(iii) Explain the relationship between simultaneous measurements of Bohr's orbit radius and the
orbit speed on the first quantum orbit.
●
•25 Go The two-dimensional, infi-
nite corral of Fig. 39-31 is square, with
edge length L = 150 pm. A square
probe is centered at xy coordinates
(0.200L, 0.800L) and has an x width of
5.00 pm and a y width of 5.00 pm. What
is the probability of detection if the
electron is in the E13 energy state?
%3D
Probe
x-
Finure 39-31 Problem 25.
Chapter 26 Solutions
COLLEGE PHYSICS
Ch. 26 - Prob. 1QAPCh. 26 - Prob. 2QAPCh. 26 - Prob. 3QAPCh. 26 - Prob. 4QAPCh. 26 - Prob. 5QAPCh. 26 - Prob. 6QAPCh. 26 - Prob. 7QAPCh. 26 - Prob. 8QAPCh. 26 - Prob. 9QAPCh. 26 - Prob. 10QAP
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- НА • Two copper nanowires are insulated by a copper oxide nano-layer that provides a 10.0- eV potential barrier. Estimate the tunnelling probability between the nanowires by 7.00-eV electrons through a 5.00-nm thick oxide layer. What if the thickness of the layer were reduced to just 1.00 nm? What if the energy of electrons were increased to 9.00 eV? ess Page T 17 System properties 6. EN - ) I hparrow_forward1A) When a completely ionized helium atom moves across a potential difference, its energy changes by AU=(-1.18x10^-15) J. What is the value of the potential difference? Provide your answer in volts, use scientific notation. Use three significant figures in your response. Ignore D2L's comment about "highest possible power", present your answer in format X.YZ*10^N. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: |x10 Answer units B) Two point charges, q1 =4.0 nC and q2 =-5.0 nC are located at A =(0.5,-1.0)m and B =(-2.6,-3.6)m, respectively. Calculate the electric potential due to these point charges at P =(-5.2,-2.7)m. Express your answer in volts, use appropriate symbols. Express your answer rounded to have at least one digit after the decimal, do not use scientific notation. Using more significant figures will not be considered incorrect, using fewer may result in errors due to rounding. Your Answer: Answer unitsarrow_forward• The K-shell ionization energy of iron is 8500 eV, and its L-shellionization energy is 2125 eV. What is the wavelength of Ka X-raysemitted by iron?arrow_forward
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