[UofT]

The answer is

2.2×10−5     in.



but, I don't know how to get the answer


Thanks guys


(and first thread post =D)

[Borek]

Do you know how to convert between m (or cm) and inches?

I suppose it is either in the book, or in your notes.

[Vidya]

The answer is

2.2×10−5     in.



but, I don't know how to get the answer

use the dimensional analysis
0.55 micro m ---> m ----> inches
You know
1m = 10^-6 micro m
1m = 39.37 inches
start with 0.55 micro m and plug in the conversion ratio to get the answer in the desired unit

[billnotgatez]

I committed to memory
1 inch is equal to to 2.54 centimeters
and it has served me well for all these years

For some reason I never did that for weight
to my regret

[Vidya]

you can work with the conversion mentioned by you
there are so many ways of doing the question
you know 1micro m = 10^-4 cm
so convert
0.55 micro m ---> cm ---> inches
You will get the same answer what we can get from my first post.

[billnotgatez]

I was told in my youth that the powers that be officially defined 1 inch as 2.54 centimeters
I did not then bother to memorize 1 meter equals 39.37 inches

To be fair
in my youth I was required to know that 12 inches made a foot and 3 feet made a yard
so the rest was easy

@Vidya to each there own

[Vidya]

we can go through inches -yard and feet also
still you will get the same answer

[billnotgatez]

still you will get the same answer

of course
we are only discussing what we need to memorize

The conversion you used may well be the best to memorize
even if it is not the definition

[Borek]

I was told in my youth that the powers that be officially defined 1 inch as 2.54 centimeters

And that's the only thing worth remembering. If someone happens to remember more - good for them, but inch cm conversion factor is defined, so everything else is just a derivative.

in my youth I was required to know that 12 inches made a foot and 3 feet made a yard
so the rest was easy

Easy? I was told to always use powers of 10, not some random number like 3 or a dozen