A 440-Nm Spectral Line Is Produced by a Transition from an Excited

question 4

Multiple Choice

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? ( = 1.055 × 10^-34 J ∙ s = 6.59 × 10^-16 eV ∙ s)

• A) 2.5 × 10^-6 s
• B) 2.5 × 10^-7 s
• C) 2.5 × 10^-8 s
• D) 2.5 × 10^-9 s
• E) 2.5 × 10^-10 s

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Definitions:

Pooled Standard Deviation

A method used to estimate a common standard deviation for two or more groups by combining their variability estimates into a single, pooled measure.

Sample Means

The average values calculated from a sample of data, used to estimate the mean of the entire population.

Defective

Pertains to items or products that fail to meet the required standards or specifications.

Nondefective

Referring to items or products that meet the required quality standards and are free of defects.