One of the things Utah is famous for is ultra-high energycosmic particles. Proto

Question

One of the things Utah is famous for is ultra-high energycosmic particles. Protons have been observed with energies of up to 1021 eV. How thick does Earth appear to theproton? (use a reasonable value for the diameter of theEarth) How old does Earth appear to the proton? One of the things Utah is famous for is ultra-high energycosmic particles. Protons have been observed with energies of up to 1021 eV. How thick does Earth appear to theproton? (use a reasonable value for the diameter of theEarth) How old does Earth appear to the proton?

Explanation / Answer

Then =[(1021eV)(1.6*10-19J/eV)]/[(1.67*10-31kg)(3*108m/s)2]    =0.106*1017    =1.06*1018
Now thickness of the earth appeared to the proton is(12.8*106m)/(1.06*1018 ) =12.07*10-12m                      = 12.07pm

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