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Worksheet: Up Quarks and Down Quarks

Q1:

How many quarks are there in a neutron?

Q2:

What is the relative charge of a down quark?

  • A 1 3
  • B 2 3
  • C 2 3
  • D 1 3
  • E1

Q3:

How many quarks are there in a proton?

Q4:

The nucleus of a carbon-14 atom contains 6 protons and 8 neutrons.

How many up quarks are in the nucleus in total?

How many down quarks are in the nucleus in total?

Q5:

Quark Up Down
Relative Charge 2 3 1 3

The table shows the relative charges of the up and down quarks. If a composite particle were made up of 3 up quarks, what would the relative charge of that composite particle be?

  • A + 4 3
  • B+1
  • C + 2 3
  • D+2
  • E+3

Q6:

What is the relative charge of an up quark?

  • A 1 3
  • B 1 3
  • C 2 3
  • D 2 3
  • E1

Q7:

Quark Relative Charge Relative Mass
Up 2 3 1 3
Down 1 3 1 3

A group of physicists detect a particle that has a relative charge of + 1 and a mass 5 3 times the mass of a proton. Which of the following composite particles, made of up and down quarks, could the mysterious particle be?

  • AUp, down, down
  • BUp, up, up
  • CUp, up, up, up, down
  • DThe particle cannot be any of these combinations.
  • EUp, up, up, down, down

Q8:

The diagram shows 4 composite particles. Each particle is made up of 3 quarks. Quarks with the letter u are up quarks, and quarks with the letter d are down quarks. Red particles are particles with a positive electric charge, and blue particles are particles with a negative electric charge.

Which of the 4 composite particles is a proton?

  • A(c)
  • B(a)
  • C(d)
  • D(b)
  • ENone

Which of the 4 composite particles is a neutron?

  • A(c)
  • B(d)
  • C(b)
  • D(a)
  • ENone

Q9:

The nucleus of a helium-4 atom contains 2 protons and 2 neutrons.

How many up quarks are in the nucleus in total?

How many down quarks are in the nucleus in total?

Q10:

Quark Up Down
Relative Charge 2 3 1 3

The table shows the relative charges of the up and down quarks. If a composite particle were made up of 3 down quarks, what would the relative charge of that composite particle be?

  • A 4 3
  • B 3
  • C 2 3
  • D 1
  • E + 2

Q11:

Which of the following is the correct symbol for an up quark?

  • A 𝑛
  • B 𝑝
  • C 𝑚
  • D 𝑢
  • E 𝑞

Q12:

Which of the following is the correct symbol for a down quark?

  • A 𝑝
  • B 𝑢
  • C 𝑛
  • D 𝑑
  • E 𝑞