Worksheet: Up Quarks and Down Quarks

In this worksheet, we will practice describing the properties of up and down quarks and the composition of protons and neutrons.

Q1:

How many quarks are there in a neutron?

Q2:

What is the relative charge of a down quark?

  • A1
  • B 1 3
  • C 2 3
  • D 1 3
  • E 2 3

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

Q6:

What is the relative charge of an up quark?

  • A 1 3
  • B 2 3
  • C 1 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, up, up, down, down
  • BThe particle cannot be any of these combinations.
  • CUp, down, down
  • DUp, up, up, up, down
  • EUp, up, up

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(d)
  • C(a)
  • D(b)
  • ENone

Which of the 4 composite particles is a neutron?

  • A(b)
  • B(c)
  • C(d)
  • 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 1
  • B 3
  • C + 2
  • D 4 3
  • E 2 3

Q11:

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

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

Q12:

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

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

Q13:

Which of the following particles are fundamental particles?

  1. Up quarks
  2. Neutrons
  3. Positrons
  4. Electrons
  5. Protons
  6. Down quarks
  7. Alpha particles
  • Aa, c, and d
  • Ba, f, and c
  • Ca and f
  • Db, d, and e
  • Ea, c, d, and f

Q14:

Which of the following particles are not fundamental particles?

  1. Down quark
  2. Positron
  3. 𝛼 particle
  4. Electron
  5. Up quark
  6. Neutron
  7. Proton
  • A(f), (g), and (d)
  • B(e), (b), and (a)
  • C(c), (f), and (g)
  • D(g), (d), and (a)
  • E(c), (f), and (a)

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