-10. It will be noticed that the tone that symbolizes the probable presence of an electron is again a lighter grey than that of the previous drawing, because the actual area depicted in the square is here again reduced to 1/100th. The sinusoid coming from the left shows the wave length of a typical gamma ray (wave length here 5 millimeters) such as is emitted from a radium-dial watch. The girl of picture 1 would on this scale have a length of about 15 million kilometers! The salt crystal would now be more than 3000 kilometers high. The sodium nucleus would be 0.0333 millimeter, the hydrogen nucleus (a proton) 0.01 millimeter.
1 cm. in picture = 10-10 cm. = 0.01 A.
Scale = 10,000,000,000:1 = 1010