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Chapter 41: Q. 3 (page 1206)
What is the difference between and ?
The difference between is proved below.
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A helium-neon laser emits a visible laser beam with a wavelength of . How many photons are emitted per second?
A sodium atom emits a photon with wavelength nm shortly after being struck by an electron. What minimum speed did the electron have before the collision?
Does each of the configurations in FIGURE Qrepresent a possible electron configuration of an element? If so,
(i) identify the element and
(ii) determine whether this is the ground state or an excited state. If not, why not?
The transition in the emission spectrum of sodium has a wavelength of .What is the energy of thestate ?
Predict the ground-state electron configurations of and ?
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