Protons and neutrons are thought to consist of smaller particles called quarks. The ‘up’ quark has a charge of $\frac{2}{3}e$ : a ‘down’ quark has a charge of $-\frac{1}{3}e$, where e is the elementary charge $(+1.6 \times 10^{–19}C)$. How many up quarks and down quarks must a proton contain?
1 )
up quarks: 0 / down quarks: 32 )
up quarks: 1 / down quarks: 13 )
up quarks: 1 / down quarks: 2تحلیل ویدئویی تست
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