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October 21, 2025, 10:15:05 pm
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Author Topic: Length Standards  (Read 955 times)  Share 

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frog1944

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Length Standards
« on: September 30, 2017, 12:39:35 pm »
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Hi,

For the length standards component of space, when we talk about how now a meter is defined as "the length of the path travelled by light in a vacuum during the time interval of 1/299,792,458 of a second", could we instead say 1/c of a second? Or do we have to memorise that number?

Thanks
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blasonduo

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Re: Length Standards
« Reply #1 on: September 30, 2017, 12:48:49 pm »
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Quote from: frog1944 on September 30, 2017, 12:39:35 pm
Hi,

For the length standards component of space, when we talk about how now a meter is defined as "the length of the path travelled by light in a vacuum during the time interval of 1/299,792,458 of a second", could we instead say 1/c of a second? Or do we have to memorise that number?

Thanks

Hello! Our formula sheet has the speed of light as 3x10^8. Always use that in calculations, so when explaining the standard metre, just say the distance travelled by light in 1/(3x10^8) of a second.

This also removes any memorisation needed :)
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frog1944

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Re: Length Standards
« Reply #2 on: September 30, 2017, 01:47:25 pm »
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Ok, thanks
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