Concept explainers
(a)
The ionisation energy required to remove an electron from the ground level.
(a)

Answer to Problem 84P
The ionisation energy is
Explanation of Solution
The ground state energy of sodium is
The ionisation energy is the energy required to move an electron from the given state to the infinite state and is given by the energy difference between the two states.
Write the relation between
Here
Write the expression for energy difference between ground state and
Here,
Substituting (I) in (II) and substituting
Substituting
Thus, the ionisation energy is
(b)
The wavelength of the emitted
(b)

Answer to Problem 84P
The wavelength of the emitted radiation is
Explanation of Solution
The energy of
Write the expression for the wavelength of the emitted radiation due to transition.
Here,
Write the expression for energy difference between
Here,
Substituting (V) in (IV)
Substituting
Thus, the wavelength of the emitted radiation is
(c)
The transition corresponding to characteristic yellow light of sodium.
(c)

Answer to Problem 84P
The transition
Explanation of Solution
The wavelength of the yellow light is
The energy of
Write the expression for energy
Substituting
Write the expression for energy difference between
Here,
Substituting
Since
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Chapter 28 Solutions
PHYSICS
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