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The quark structure of protons and neutrons appears at the minute length-scale of 1015m or less. This structure was first probed in early 1970’s using high energy electron beams produced by a linear accelerator at Stanford, USA. Guess the order of energy of these electron beams. (Take wavelength of a proton = 1015m ; rest mass of energy of electron = 0.511MeV)

(a)1.24BeV(b)12.4BeV(c)1.98BeV(d)19.8BeV

 

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