he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.
change 3.9hrs to seconds,multipy by the speed of light.
To find out how many kilometers a pulse from a laser beam travels in exactly 3.9 hours, we can use the formula:
Distance = Speed × Time
First, let's convert the speed of light from meters per second to kilometers per hour:
Speed of light = 3.00 × 10^8 m/s
To convert meters per second to kilometers per hour, we need to multiply by the conversion factor:
1 kilometer = 1000 meters
1 hour = 3600 seconds
So, the speed of light in kilometers per hour is:
Speed of light = (3.00 × 10^8 m/s) × (3600 s/1 hour) × (1 km/1000 m)
Now, let's calculate the distance traveled by the laser pulse in 3.9 hours:
Distance = Speed of light × Time
Distance = (3.00 × 10^8 km/h) × (3.9 hours)
Now, we can calculate the final answer by performing the multiplication:
Distance = 3.00 × 10^8 × 3.9 km
Therefore, a pulse from a laser beam would travel approximately 1.17 × 10^9 kilometers (or 1.17 billion kilometers) in exactly 3.9 hours.