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Astronomy & space · Grades 9–12

One-way signal delay

This exercise uses a constant distance and straight-line light travel, not a spacecraft maneuver model.

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Method and conditions

This exercise uses a constant distance and straight-line light travel, not a spacecraft maneuver model.

t = d/c

Worked examples

A probe is 47400000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

Divide distance 47400000 km by 300000 km/s.

158 s

A probe is 19000000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

Divide distance 19000000 km by 300000 km/s.

63.3333 s

Try it

  1. A probe is 21900000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

  2. A probe is 17800000 km away. Use signal speed 300000 km/s and find its one-way communication delay. Round the final result to 4 decimal places if needed. Answer in s.

Check your work

Answers and marking notes
  1. 73 s

    Divide distance 21900000 km by 300000 km/s.

  2. 59.3333 s

    Divide distance 17800000 km by 300000 km/s.

Further reading and review references

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