Question

An antibaryon composed of two antiup quarks

and one antidown quark would have a charge of
(1) +1e (3) 0e
(2) −1e (4) −3e

Answer 1

(2) −1 e

Step-by-step explanation:

A quark is the lightest elementary particles which form hadron such as proton and neutron. A quark has fractional charge.

Up, charm and top quarks have
`+(2)/(3) e` charge where as down, strange and bottom quarks have
`-(1)/(3)e` charge.

The antiparticle of up quark is antiup quark and has charge
`-(2)/(3)e` charge.

The antiparticle of down quark is antidown quark and has charge
`+(1)/(3)e` charge.

An antibaryon is composed of two anti-up quark and one anti-down quark.

Net charge of the anti-baryon is:

`2* (-(2)/(3) e)+1* (+(1)/(3))e=-1e`

Thus, antibaryon has -1e charge.