On 4/25/2020 3:33 PM, Alan Grayson wrote:
On Sunday, January 6, 2019 at 12:53:52 AM UTC-7, Brent wrote:
To measure small things you need comparably short wavelengths. If you
make a photon with a wavelength so short it can measure the Planck
length it will have so much mass-energy that it will fold spacetime
around it and become a black hole...so you won't be able to use it to
measure anything.
Brent
I understand the BH issue. But suppose we want to measure the diameter
of a proton and use photons of large wave length, say of radio
frequency. If we're looking for a shadow on a screen, why won't the
large wavelength leave a discernible shadow of the proton? Or is it
the back scattering we look for? Same question; that is, why must the
impinging wavelength be of comparable length to measure a physical
object of the same approximate length? TIA, AG
If you use a wavelength that is not shorter than the dimension you're
measuring your resolution is just the wavelength. The waves refract
around the object so you can't resole edges.
Brent
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