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Lesson: The Atomic Nucleus

Worksheet • 5 Questions

Q1:

What is the main attractive force between particles in the nucleus of an atom?

  • AStrong nuclear force
  • BElectrostatic force
  • CWeak nuclear force
  • DElectromagnetic force
  • EGravity

Q2:

The radius of an atomic nucleus, 𝑅 , can be estimated using the equation: where π‘Ÿ = 1 . 2 0 f m and 𝐴 is the number of nucleons in the nucleus. Assuming the nucleus is spherical in shape, find an expression for the approximate average nuclear density in atomic mass units per unit volume.

  • A 3 4 πœ‹ π‘Ÿ 3 0
  • B 𝐴 πœ‹ π‘Ÿ 2 3 3 0
  • C 𝐴 4 πœ‹ π‘Ÿ 1 3 2 0
  • D π‘Ÿ 3 πœ‹ 𝐴 2 0 2 3
  • E πœ‹ π‘Ÿ 3 𝐴 3 0

Q3:

A neutron star has a mass of 2.40 solar masses and a diameter of 26.0 km. A solar mass is 1 . 9 9 Γ— 1 0 3 0 kg.

Calculate the density of the neutron star, assuming it is spherical.

  • A 5 . 2 Γ— 1 0 1 7 kg/m3
  • B 6 . 5 Γ— 1 0 1 6 kg/m3
  • C 2 . 2 Γ— 1 0 1 7 kg/m3
  • D 1 . 7 Γ— 1 0 1 7 kg/m3
  • E 1 . 6 Γ— 1 0 1 8 kg/m3

A uranium-235 nucleus has a diameter of 15.0 fm. Calculate the density of this nucleus as a percentage of the density of the neutron star.

Q4:

A neutron star has a mass of 1.97 solar masses and a diameter of 13.0 km. A solar mass is 1 . 9 9 Γ— 1 0 3 0 kg.

What is the density of the neutron star to two significant figures, assuming it is spherical?

  • A 3 . 4 Γ— 1 0 1 8 kg/m3
  • B 1 . 4 Γ— 1 0 1 9 kg/m3
  • C 2 . 7 Γ— 1 0 1 9 kg/m3
  • D 6 . 0 Γ— 1 0 1 9 kg/m3
  • E 8 . 8 Γ— 1 0 1 8 kg/m3

A hydrogen nucleus has a diameter of 1.75 fm. What is the density of this nucleus as a percentage of the density of the neutron star, to two significant figures?

Q5:

The radius of the nucleus of 6 3 2 9 C u is approximately 4.8 pm. What is the average density of the nucleus to one significant figure, assuming it is spherical in shape?

  • A 2 Γ— 1 0 1 4 g/cm3
  • B 7 Γ— 1 0 1 4 g/cm3
  • C 3 Γ— 1 0 1 7 g/cm3
  • D 2 Γ— 1 0 1 7 g/cm3
  • E 7 Γ— 1 0 1 4 g/cm3
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