Question

What is the propagation time if the distance between the two points is 12,000 km? Assume the propagation speed to be 2.4 108 m/s in cable?

Answer 1

Given:

Distance between two points is 12000 km.

And propagation speed is 2.4 × 10⁸ m/s.

To find:

Propagation time ?

Calculation:

• Time required for propagation between the two points is equal to the distance divided by propagation speed .

$\therefore \: t = \dfrac{distance}{speed}$

$\implies \: t = \dfrac{12000 \: km}{2.4 \times {10}^{8} \: m {s}^{ - 1} }$

$\implies \: t = \dfrac{12000 \times {10}^{3} \: m}{2.4 \times {10}^{8} \: m {s}^{ - 1} }$

$\implies \: t = \dfrac{0.12 \times {10}^{8} \: m}{2.4 \times {10}^{8} \: m {s}^{ - 1} }$

$\implies \: t = 0.05 \: sec$

So, time needed is 0.05 seconds