# The Naked Scientists Forum

### Author Topic: Light travels 10 meters how fast?  (Read 4440 times)

#### sstaubin

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• Posts: 3
##### Light travels 10 meters how fast?
« on: 30/10/2006 21:17:13 »
Here's a basic question.

Measured in seconds, how fast does light travel 10 meters?

Could you show me how you came up with the answer?

Thanks.

#### syhprum

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##### Re: Light travels 10 meters how fast?
« Reply #1 on: 30/10/2006 21:25:29 »
Light travels at 300,000 Km/S hence to travel 10 meters would take 1/30 micro seconds

#### sstaubin

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##### Re: Light travels 10 meters how fast?
« Reply #2 on: 30/10/2006 21:40:23 »
Is that .0000333333 seconds?
« Last Edit: 30/10/2006 21:55:12 by sstaubin »

#### Soul Surfer

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• Posts: 3345
• keep banging the rocks together
##### Re: Light travels 10 meters how fast?
« Reply #3 on: 30/10/2006 22:52:21 »
300,000 km/sec  =300,000,000 m/sec  three hundred million meteres per second.

so ten metres in  1/ 30,000,000 sec or  1/30 microseconds as stated

-6
this is 0.033  x10      or 0.00000003333 seconds

however I always found it best to think of it travelling about a foot in about one nanosecond  which  gets the scale right

#### sstaubin

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• Posts: 3
##### Re: Light travels 10 meters how fast?
« Reply #4 on: 31/10/2006 00:01:22 »
Seven zeros... That's what I thought at first, but a calculator convinced me otherwise.

Thanks.

#### lightarrow

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##### Re: Light travels 10 meters how fast?
« Reply #5 on: 31/10/2006 13:46:47 »
Never make us convince from calculators!

#### simeonie

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• Posts: 351
##### Re: Light travels 10 meters how fast?
« Reply #6 on: 07/11/2006 13:21:48 »
AHEM it is 286,000 km/s lol

#### lightarrow

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##### Re: Light travels 10 meters how fast?
« Reply #7 on: 07/11/2006 19:27:58 »
AHEM it is 286,000 km/s lol
What, it is 286,000 km/s?

#### syhprum

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##### Re: Light travels 10 meters how fast?
« Reply #8 on: 07/11/2006 20:00:26 »
This erroneous value for 'c' just shows the folly of mixing metric and imperial units!

#### lightarrow

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##### Re: Light travels 10 meters how fast?
« Reply #9 on: 08/11/2006 12:49:03 »
Ok, but, in case, it's 186,000 miles/hour.

#### eric l

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##### Re: Light travels 10 meters how fast?
« Reply #10 on: 08/11/2006 13:49:10 »
Ok, but, in case, it's 186,000 miles/hour.
Seems very slow light to me, if it is indeed miles/hour and not miles/second !

#### lightarrow

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##### Re: Light travels 10 meters how fast?
« Reply #11 on: 08/11/2006 19:26:51 »
186,000 miles/second. I wanted to see if you were careful!
(i hope someone could believe me!)

#### The Naked Scientists Forum

##### Re: Light travels 10 meters how fast?
« Reply #11 on: 08/11/2006 19:26:51 »

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