Question

Light travels at a constant speed. The speed of light in a vacuum is about 3 * 10 meters per second. The speed of light can also be measured in kilometers per second or miles per second Find kilo per Dra pla (Note: 1 m = 0.001 km and 1 m is about 0.00062 mi) The speed of light is about kilometers per second. L8C The speed of light is about miles per second 18

Answer 1

The speed of light in a vacuum is about 3. 0 x 10 ^8 meters per second.

The speed of light can also be measured in kilometers per second or miles per second.

(Note: 1 m = 0.001 km and 1 m is about 0.00062 mi).

1. The speed of light in kilometers per second.

`\begin{gathered} \text{Given }1\text{ m = 0.001 km,} \\ 3.0\text{ x 1}0^8m=3.0x10^{8\text{ }}\text{ x 0}.001=300,000km=3x10^5 \end{gathered}`
`\text{Hence, the sp}eedoflightis3x10^{\text{ 5}}\text{ kilometers per second}`

2. The speed of light in miles per second.

Given 1 m = 0.00062 miles

`\begin{gathered} 3x10^8m=3x10^{8\text{ }}X0.00062=186,000=1.86X10^{5\text{ }}miles \\ \text{Hence, the sp}eedoflightisalso1.86x10^{5\text{ }}miles\text{ per second.} \end{gathered}`