GK
UNITS DEVICES DIMENSIONS AND MEASUREMENTS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Tesla
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Fermi
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Newton
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None of above
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Detailed explanation-1: -Nuclear sizes are expressed in a unit called “Fermi” which is a unit of length equal to 1015 metre(one femtometre), used in nuclear physics. It is similar to the diameter of a proton.
Detailed explanation-2: -’unit of measurement’) is a unit of length in the International System of Units (SI) equal to 10−15 metres, which means a quadrillionth of one metre. This distance is sometimes called a fermi and was so named in honour of Italian-American physicist Enrico Fermi, as it is a typical length-scale of nuclear physics.
Detailed explanation-3: -We can calculate the size of the nucleus, by obtaining the point of closest approach of an alpha particle. By shooting alpha particles of kinetic energy 5.5 MeV, the point of closest approach was estimated to be about 4×10-14m.