If Barium Has a Work Function of 2

question 79

Multiple Choice

If barium has a work function of 2.6 eV,what is its cutoff wavelength when used as a phototube target? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J and 1 nm = 10−⁹ m)

• A)765 nm
• B)478 nm
• C)777 nm
• D)380 nm

---

Definitions:

Receptive Fields

Specific areas in the visual field that, when stimulated, affect the firing rate of neurons in the sensory pathways.

Cultural Heritage

An inheritance of material items and immaterial characteristics from previous generations within a group or society.

Psychology

The scientific study of mind and behavior, including the study of consciousness, perception, emotion, motivation, brain functioning, and personality.

Sociohistorical Context

The background of social and historical influences on a person's behavior, attitudes, and opportunities.