What Is the Photon Energy of Red Light Having a Wavelength

question 29

Multiple Choice

What is the photon energy of red light having a wavelength of 6.40 × 10² nm? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

• A)1.13 × 10^-19 J
• B)1.31 × 10^-19 J
• C)3.11 × 10^-19 J
• D)1.94 × 10^-19 J

---

Definitions:

Net Profit Margin Percentage

A financial metric that shows the percentage of profit a company makes for every dollar of sales, calculated by dividing net profit by total revenue.

Average Sale Period

A financial metric measuring the average time it takes for a company's inventory to turn into sales, often seen as part of inventory turnover analysis.

Price-earnings Ratio

A valuation metric that compares a company's current share price to its per-share earnings.

Dividend Payout Ratio

A financial metric that measures the percentage of a company's earnings paid out to shareholders as dividends, indicating how much money a company returns to shareholders versus how much it keeps to reinvest.