When a Certain Metal Is Illuminated by Light,photoelectrons Are Observed

question 25

Multiple Choice

When a certain metal is illuminated by light,photoelectrons are observed provided that the wavelength of the light is less than 669 nm.Which one of the following values is closest to the work function of this metal? (h = 6.626 × 10^-34 J ∙ s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10^-19 J)

• A)1.9 eV
• B)2.0 eV
• C)2.2 eV
• D)2.3 eV

---

Definitions:

Flagellated Collar Cells

Specialized cells found in sponges that have a flagellum surrounded by a collar used to pump water through the sponge and trap food particles.

True Coelom

A fluid-filled body cavity completely lined by tissue derived from the mesoderm, found in most complex animals, which provides a space for organ development and movement.

Sponges

Simple aquatic animals that draw water containing food particles into their porous bodies by means of flagellated cells.

Hydras

A type of small, freshwater organisms from the phylum Cnidaria, known for their regenerative abilities.