Uncertainty Principle Using ΔEΔt ≥ ħ: a 440-Nm Spectral Line

question 14

Multiple Choice

Uncertainty principle using ΔEΔt ≥ ħ: A 440-nm spectral line is produced by a transition from an excited state to the ground state. The natural line width of the spectral line is 0.020 pm. The average time the atom spends in the excited state is closest to which of the following? (ħ = 1.055 × 10^-34 J ∙ s = 6.59 × 10^-16 eV ∙ s)

• A) 5 × 10^-6 s
• B) 5 × 10^-7 s
• C) 5 × 10^-8 s
• D) 5 × 10^-9 s
• E) 5 × 10^-10 s

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Definitions:

Industry Supply

The total output of goods or services that producers in an industry are willing and able to sell at different price levels, during a certain time period.

Long-run Supply Curve

A graphical representation showing the relationship between market price and the amount of goods supplied by producers, considering all factors of production can be varied.

Competitive Industry

An industry with many firms competing against each other, with no single firm dominating the market.

Relevant Resources

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