Quark Charge Composition for Hadron

Steps:

• Recall quark charges: up (u) quark has +2/3 e, down (d) quark has -1/3 e.
• Compute total charge for each option by summing individual charges.
• Option A (udd): +2/3 e -1/3 e -1/3 e = 0.
• Option B (uud): +2/3 e +2/3 e -1/3 e = +3/3 e = +e.

Why B is correct:

• The uud combination yields a total charge of +e, matching the hadron's charge as defined by the elementary charge e.

Why the others are wrong:

• A (udd): Total charge is 0, forming a neutral particle like the neutron.
• C (ud): Total charge is +1/3 e, which is a fractional charge not equal to +e.
• D (uuu): Total charge is +2 e, exceeding the given +e.

Final answer: B