Nanoseconds and Time for Light to Travel

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SUMMARY

The discussion focuses on calculating the time in nanoseconds for light to travel 1 kilometer in a vacuum. It establishes that light travels at approximately 0.3 meters per nanosecond. To solve the problem, the formula time = distance/velocity is applied, where distance is 1000 meters and velocity is 0.3 meters per nanosecond. The conclusion is that the time taken for light to travel 1 km is approximately 3333.33 nanoseconds.

PREREQUISITES
  • Understanding of basic physics concepts, specifically speed, distance, and time.
  • Familiarity with unit conversions, particularly between kilometers, meters, and nanoseconds.
  • Knowledge of the speed of light in a vacuum.
  • Ability to manipulate equations and solve for unknown variables.
NEXT STEPS
  • Research the speed of light in different mediums and its implications on time calculations.
  • Learn about advanced unit conversion techniques for various scientific measurements.
  • Explore the concept of relativistic effects on time and distance in physics.
  • Study the applications of time measurement in modern technology, such as GPS and telecommunications.
USEFUL FOR

Students studying physics, educators teaching basic physics concepts, and anyone interested in the practical applications of light speed and time measurement.

Dsingh
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Homework Statement


The problem asks how many nanoseconds does it take for light to travel 1km in a vacuu?

Homework Equations


I know that 1KM is equal to 1000 meters or 10^3. I also know that 1ns is equal to 10^-9s and light travels at about .3m per ns.


The Attempt at a Solution



I'm not sure where to start with this problem. I know I have to convert the two givens but I am stuck at where to start. I started to think that I could divide the .3m per ns by 10^9 and then multiply it by 10^3. If someone could help me figure out how to start this problem and a push in the right direction that would be highly appreciated. Thanx in advanced.
 
Physics news on Phys.org
You probably remember:
distance = velocity x time

so

time = distance/velocity.

for constant velocity. So use that.
You can always get the right relation by considering the units on both sides if you don't see it right away.
 

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