How many miles per second does light travel?

How many miles per second does light travel?

• A. 186,000 miles per second
• B. 186,000 miles per hour
• C. 186,000 kilometers per second
• D. 1,860,000 miles per second

Answer: (A)

Light travels in a vacuum at a fixed speed: about 3.0 × 10^8 meters per second, which is roughly 186,000 miles per second. The option that states 186,000 miles per second is the best choice because it matches this standard value, using the correct units (miles per second). The exact speed is 186,282 miles per second, but rounding to 186,000 is common for educational questions. The other options misstate the units or the magnitude: miles per hour uses a per-hour rate, which isn’t the standard way to express light’s speed; kilometers per second would be about 299,792 km/s, not 186,000; and 1,860,000 miles per second is ten times too large.

Light travels in a vacuum at a fixed speed: about 3.0 × 10^8 meters per second, which is roughly 186,000 miles per second. The option that states 186,000 miles per second is the best choice because it matches this standard value, using the correct units (miles per second). The exact speed is 186,282 miles per second, but rounding to 186,000 is common for educational questions. The other options misstate the units or the magnitude: miles per hour uses a per-hour rate, which isn’t the standard way to express light’s speed; kilometers per second would be about 299,792 km/s, not 186,000; and 1,860,000 miles per second is ten times too large.