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Problems&Exercises
By calculating its wavelength, show that the first line in the Lyman series is UV radiation.
so that
, which is UV radiation.
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Look up the values of the quantities in
, and verify that the Bohr radius
is
.
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Verify that the ground state energy
is 13.6 eV by using
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A hydrogen atom in an excited state can be ionized with less energy than when it is in its ground state. What is
for a hydrogen atom if 0.850 eV of energy can ionize it?
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Find the radius of a hydrogen atom in the
state according to Bohr’s theory.
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(a) Which line in the Balmer series is the first one in the UV part of the spectrum?
(b) How many Balmer series lines are in the visible part of the spectrum?
(c) How many are in the UV?
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A wavelength of
is observed in a hydrogen spectrum for a transition that ends in the
level. What was
for the initial level of the electron?
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A singly ionized helium ion has only one electron and is denoted
. What is the ion’s radius in the ground state compared to the Bohr radius of hydrogen atom?
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A beryllium ion with a single electron (denoted
) is in an excited state with radius the same as that of the ground state of hydrogen.
(a) What is
for the
ion?
(b) How much energy in eV is needed to ionize the ion from this excited state?
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Atoms can be ionized by thermal collisions, such as at the high temperatures found in the solar corona. One such ion is
, a carbon atom with only a single electron.
(a) By what factor are the energies of its hydrogen-like levels greater than those of hydrogen?
(b) What is the wavelength of the first line in this ion’s Paschen series?
(c) What type of EM radiation is this?
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Verify Equations
and
using the approach stated in the text. That is, equate the Coulomb and centripetal forces and then insert an expression for velocity from the condition for angular momentum quantization.
so that
From the equation
we can substitute for the velocity, giving:
so that
where
.
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The wavelength of the four Balmer series lines for hydrogen are found to be 410.3, 434.2, 486.3, and 656.5 nm. What average percentage difference is found between these wavelength numbers and those predicted by
? It is amazing how well a simple formula (disconnected originally from theory) could duplicate this phenomenon.
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Questions & Answers
Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
can you send the book attached ?
Ariel
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2
find mu of x for y
U(x,y) = (xÃy)1/2
find mu of x for y
Desalegn
this is the study of how the society manages it's scarce resources
Belonwu
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
difference between firm and industry
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from
Qd 120 3P
to
Qd 90 3P
and the supply function has shifted from
QS
20 2P
to
QS
10 2P .
a) Find the effect of this change on price and quantity.
b) Which of the changes in demand and supply is higher?
explain standard reason why economic is a science
factors influencing supply
scares
means__________________ends
resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Why qualify 28 supplies
Milan
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
identify a demand and a supply curve
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
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Source:
OpenStax, College physics. OpenStax CNX. Jul 27, 2015 Download for free at http://legacy.cnx.org/content/col11406/1.9
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