Compose the expression for a quantity whose dimension is length, using velocity of light `c`, mass of a particle `m`, and Planck's constant `h`. What is that quantity?

Explanation

The unit of `cancelh` is Jpule.sec. Since `mc^(2)` is the rest mass enegry, `(cancelh)/(mc^(2))` has the dimension of time and multiplying by `c` we get a quantity
`cancellambda_(c) =(cancelh)/(mc)`.
whose dimension is lingth. This quantity is called reduced compton wavelength.
(The name compton wavelengths is traditionally reserved for `(2pi cancelh)/(mc))`.