Question

Light travels about 3 x 10^5 metres per second. Find the time it takes to travel 1 metre. Give your answer in standard form.

Answer 1

t=3.3*
`10^(-6)`

Explanation:

t=
`(S)/(v)`

As

S=1m

v=3*
`10^(5)`ms^-1

t=
`(1)/(3*10^(5) )`

t=3.3*
`10^(-6)`

Answer 2

Answer: According to the universe in which your light only moves at 3x10^5 meters/sec, it would take 3.333x10^-6 seconds to go 1 meter. Where I live (Earth in the Milky Way Galaxy), light travels 3x10^8 m/s. It only requires 3.33x10^-9 second. So there . . .

Explanation:

The speed of light is in units of meters/sec. If it is 3x10^5 meters/sec, we can also write the inverse:

1 sec/3x10^5 meters [It takes 1 sec to go 3x10^5 meters]

Do the division to find seconds per 1 meter: 3.333x10^-6 seconds.

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For Milky Way inhabitants, the division is 1 sec/3x10^8 meters, or 3.33x10^-9 second. Time flies for them.