use the face that the speed of light in a vacuum is about 3.00 x10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours

distance=speed*time

= 3E8m/s*18hrs*3600sec/hr

To determine the distance traveled by a pulse from a laser beam in exactly eighteen hours, we can use the speed of light in a vacuum, which is approximately 3.00 x 10^8 m/s.

First, let's convert the time from hours to seconds. There are 3600 seconds in one hour, so 18 hours is equal to 18 x 3600 = 64800 seconds.

Now, we can use the formula for distance:
Distance = Speed x Time

Substituting the values:
Distance = 3.00 x 10^8 m/s x 64800 seconds

Calculating this gives us:
Distance = 1.944 x 10^13 meters.

To convert this distance to kilometers, we need to divide by 1000 since there are 1000 meters in a kilometer.

Therefore, the pulse from the laser beam travels approximately 1.944 x 10^10 kilometers in exactly eighteen hours.

To determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours using the speed of light, you can follow these steps:

Step 1: Convert the speed of light given in meters per second to kilometers per second.
- The speed of light in a vacuum is approximately 3.00 x 10^8 m/s.
- To convert meters to kilometers, divide by 1000: 3.00 x 10^8 m/s / 1000 = 3.00 x 10^5 km/s.

Step 2: Calculate the distance traveled in kilometers in one second by multiplying the speed of light in kilometers per second by the number of seconds in an hour.
- Since there are 3600 seconds in an hour, multiply the speed of light (3.00 x 10^5 km/s) by 3600: 3.00 x 10^5 km/s * 3600 = 1.08 x 10^9 km/h.

Step 3: Calculate the total distance traveled in kilometers in eighteen hours by multiplying the distance traveled in one hour by eighteen.
- Multiply the distance traveled in one hour (1.08 x 10^9 km/h) by eighteen: 1.08 x 10^9 km/h * 18 = 1.944 x 10^10 km.

Therefore, a pulse from a laser beam would travel approximately 1.944 x 10^10 kilometers in exactly eighteen hours.