Question

Effective radius of a proton; 1.2 × 10–15m __________

Answer 1

Answer:

Effective radius of a proton; 1.2 × 10–15m

Answer 2

Radius of a proton = (8.775±0.005)×10−16 m (or 0.8775 fm).

Explanation:

Proton has an electrical charge. So when electrons are fired at it, the electrons get scattered due to the electric charge. By studying the pattern of this scatter, the size of a proton is inferred. This experiment is known as the spectroscopy method.

The above experiment indicates that the proton has an effective charge radius of about 0.877 femtometers.  Femto means one quadrillionth of a metre or 1×10^-15 metre.