A Li²⁺ Ion Undergoes a Transition from the N =

question 27

Multiple Choice

A Li²⁺ ion undergoes a transition from the n = 4 to the n = 3 state. The energy of the emitted photon is

• A) 4.5 eV
• B) 10.2 eV
• C) 5.95 eV
• D) 2.6 eV
• E) 0.66 eV

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Definitions:

Just Noticeable Difference

The minimal change in stimulus intensity required to detect a difference between two stimuli, according to psychophysical research.

Visual Acuity

The sharpness or clarity of vision, often measured by the ability to discern letters or numbers at a given distance according to a standardized chart.

Absolute Threshold

The minimum level of stimulus intensity needed for a stimulus to be perceived or detected at least half the time by an observer.

Perceptual Invariance

The ability to perceive the unchanging properties of objects (shape, size, brightness, color) despite variations in the sensory input.