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PPSC / FPSC / NTS · Everyday science · Parcha original · Sample

The speed of light in a vacuum is about:

  1. A. 3 × 10⁸ m/s✓ Correct answer
  2. B. 3 × 10⁶ m/s
  3. C. 340 m/s
  4. D. 3 × 10⁵ m/s

Explanation

Light travels at about 3 × 10⁸ m/s (300,000 km/s) in a vacuum. 340 m/s is roughly the speed of sound in air.

خلا میں روشنی کی رفتار تقریباً 3 × 10⁸ m/s (تین لاکھ کلومیٹر فی سیکنڈ) ہے۔ 340 m/s ہوا میں آواز کی رفتار ہے۔