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Scientists developed different models of the atom as new discoveries were made - AQA - GCSE Physics - Question 2 - 2023 - Paper 1

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Scientists developed different models of the atom as new discoveries were made. Which particle in the atom was discovered first? Tick (✓) one box. Electron Neut... show full transcript

Worked Solution & Example Answer:Scientists developed different models of the atom as new discoveries were made - AQA - GCSE Physics - Question 2 - 2023 - Paper 1

Step 1

Which particle in the atom was discovered first?

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Answer

The particle that was discovered first in the atom is the electron. This particle was identified in the late 19th century by J.J. Thomson.

Step 2

Calculate the radius of a gold nucleus in femtometres.

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Answer

To calculate the radius of a gold nucleus, use the formula:

extRadiusofgoldnucleus=extRadiusofalphaparticleimes4.2 ext{Radius of gold nucleus} = ext{Radius of alpha particle} imes 4.2

Substituting the given radius of the alpha particle (1.7 femtometres):

extRadiusofgoldnucleus=1.7imes4.2=7.14extfemtometres ext{Radius of gold nucleus} = 1.7 imes 4.2 = 7.14 ext{ femtometres}

Step 3

What are the charges on an alpha particle and a gold nucleus?

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Answer

An alpha particle is positively charged, while a gold nucleus is also positively charged due to the protons. Thus, the correct selection is:

An alpha particle and a gold nucleus are both positively charged.

Step 4

Which statement describes the force between the alpha particle and the gold nucleus?

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Answer

The interaction between the positively charged alpha particle and the positively charged gold nucleus leads to a repulsive force.

The correct choice is: A force of repulsion.

Step 5

Which model in Table 1 was developed first?

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Answer

The model developed first, according to Table 1, is the Bohr model.

Step 6

Which model in Table 1 was developed last?

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Answer

The model that was developed last in Table 1 is tiny spheres that cannot be divided.

Step 7

Which model in Table 1 was developed last?

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Answer

The last model developed in Table 1 is again the tiny spheres that cannot be divided.

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