What is the frequency, in s1, of the light emitted when the electron in a hydrog
ID: 995347 • Letter: W
Question
What is the frequency, in s1, of the light emitted when the electron in a hydrogen atom drops from the energy level ni = 12 to nf = 5?
Calculate the de Broglie wavelength, in nanometers, associated with a 145 g baseball traveling at a speed of 179 km/h?
How many orbitals have the values n = 4, l = 3, and ml = -2?
Without referring to any tables or listings in the text, name the elements provided for each of the following.
A sixth-period element whose atoms have three unpaired p electrons?
A d-block element having one 4s electron?
A p-block element that is a metal?
Explanation / Answer
From Rydburg's Equation , 1/ = R[(1/ni2) – (1/nf2)]
Where R = Rydburg's constant = 10.96 x106 m-1
= wavelength = ?
ni = 5
nf = 12
Plug the values we get 1/ = 362.29x103
Frequency,v = c/ = cx(1/)
Where c = speed of light = 3.0x108 m/s
So v = 3.0x108 x362.29x103 = 1.087x1014 s-1
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According to de Broglie wave length, = h/mv
Where
h = plank's constant = 6.625x 10-34 Js
= wave length = ?
m = mass of object = 145 g
v = velocity of object = 179 km/h = 179x0.278 m/s = 49.762 m/s
Plug the values we get = 9.18x10-38 m
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There is only one orbital with n = 4, l = 3, and ml = -2
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A sixth-period element whose atoms have three unpaired p electrons?
three unpaired p electrons menas it belongs to VA group & it is the 6th period element .So the element is Tl.
A d-block element having one 4s electron?
It is Potassium (K)
A p-block element that is a metal is Gallium
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