Visible Light Frequency Range

Steps:

• Visible light wavelengths range from 400 nm (violet) to 700 nm (red).
• Speed of light in vacuum: c = 3.0 × 10^8 m/s.
• Frequency f = c / λ; calculate for range: at 600 nm (yellow-green), f ≈ 5.0 × 10^14 Hz.
• Option A falls within 4.3–7.5 × 10^14 Hz range for visible light.

Why A is correct:

• Matches the electromagnetic spectrum definition for visible light (≈10^14 Hz order).

Why the others are wrong:

• B: 5.0 × 10^15 Hz is ultraviolet (shorter wavelengths, higher energy).
• C: 5.0 × 10^16 Hz is extreme ultraviolet or soft X-ray.
• D: 5.0 × 10^17 Hz is X-ray or gamma ray range.

Final answer: A