A signal travels at the speed of light and takes 4.0 milliseconds to reach you from a satellite. How far is the satellite?

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Prepare for the Dual Enrollment Physical Science Midterm. Study with flashcards and multiple choice questions, each with hints and explanations. Ace your exam!

Multiple Choice

A signal travels at the speed of light and takes 4.0 milliseconds to reach you from a satellite. How far is the satellite?

Explanation:
Distance traveled by a signal is found by multiplying its speed by the time it travels. Since the signal moves at the speed of light, distance = c × t. Convert 4.0 milliseconds to seconds: 4.0 × 10^-3 s. With c ≈ 3.00 × 10^8 m/s, multiply: (3.00 × 10^8 m/s) × (4.00 × 10^-3 s) = 1.20 × 10^6 m. So the satellite is 1.20 × 10^6 meters away, about 1,200 kilometers.

Distance traveled by a signal is found by multiplying its speed by the time it travels. Since the signal moves at the speed of light, distance = c × t. Convert 4.0 milliseconds to seconds: 4.0 × 10^-3 s. With c ≈ 3.00 × 10^8 m/s, multiply: (3.00 × 10^8 m/s) × (4.00 × 10^-3 s) = 1.20 × 10^6 m. So the satellite is 1.20 × 10^6 meters away, about 1,200 kilometers.

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