What is the propagation time if the distance between the two points is 48,000…
2014
What is the propagation time if the distance between the two points is 48,000 Km ? Assume the propagation speed to be 2.4 × 108 metre/second in cable.
- A.
0.5 ms
- B.
20 ms
- C.
50 ms
- D.
200 ms
Attempted by 483 students.
Show answer & explanation
Correct answer: D
Key insight: use t = distance ÷ speed.
the distance 48,000 kilometres: convert to metres: 48,000 km = 48,000 × 1,000 = 48,000,000 m.
Compute the propagation time: t = 48,000,000 m ÷ 2.4×10^8 m/s = 0.2 s = 200 ms.
the propagation time is 200 ms (this matches the 200 ms option).