The Wavelength of a Ruby Laser Is 694

question 20

Multiple Choice

The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.6022 × 10^-19 J)

• A) 1.537 eV
• B) 1.646 eV
• C) 1.786 eV
• D) 1.812 eV
• E) 3.572 eV

---

Definitions:

Sales Journal

A record of sales transactions where credit sales are recorded.

Gross Profit

The financial metric that represents the difference between sales revenue and the cost of goods sold, before deducting overheads, payroll, taxation, and interest payments.

Profit Center

A branch or division of a company that is treated as a separate entity for the purpose of calculating its profitability.

Profit Center

A division or segment of a company that is directly responsible for generating its own revenue and profit through its activities.