Question

3X10^8 Ms^-1/1368X10 s^-1=?, step by step answer plz...

Answer 1

Answer:

2 192 982.46 m-1 s-1

Step-by-step explanation:

this is the best answer to your question

Answer 2

Answer:

As mentioned below, the speed of light in vacuum to be precise is exactly 299,792,458 m/s

First things first, look at my above bold statement, I am claiming the speed of light is precisely so much, and haven't mentioned any errors in that. How can that be? When you measure something, regardless of how good your instruments are, there will always be a least count error, but the speed of light in vacuum iS EXACTLY THAT VALUE.

WHY? or HOW?

Simple, because we chose it to be that :D

When you are measuring something, you need some standard right?

For length what is 1 meter? We used to have an alloy kept in some secure vault somewhere (yea just google for details :P), and the length of that alloy BY DEFINITION would be 1 meter, and replicas of it would be made and distributed to other countries, so they can use that standard and make rulers and other precision instruments.

Later we realized, regardless of how good replicas these alloys are, they will still vary in length, because of thermal expansion. So suppose the replica in India is a tinni winnie bit larger than that of say China. Then 1 meter of India would be more than 1 meter of china. (that is insane) . This can easily throw our world into chaos!

So we finally decided to not use some physical thing (whose size may change) for standard, but use the speed of light. We are awesome when it comes to measurements in time, because of our quantum mechanical knowledge.

So now what is 1 meter?

we decided

the distance traveled by light in 1 second = 299792458 m

THIS IS DECIDED, NOT MEASURE.

so 1 meter would be the distance traveled by light in 1/299792458th of a second.

You may be wondering why that particular number? Because we don't want a number which makes our 1 meter very different than what we used to have before. So by looking at what 1 meter everyone was using (according to their own replicas) we finally chose a number which would be very close and accepted by everyone (so they wouldn't have to change much of their standards), and that number turns out to be 299,792,458

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