a) One isotope of uranium is U-235 - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1
Question 5
a) One isotope of uranium is U-235.
The nucleus can be represented as $^{235}_{92}U$.
Complete the following sentence.
A nucleus of U-235 contains __________ pro... show full transcript
Worked Solution & Example Answer:a) One isotope of uranium is U-235 - Edexcel - GCSE Physics - Question 5 - 2017 - Paper 1
Step 1
Complete the following sentence.
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Answer
A nucleus of U-235 contains 92 protons and 143 neutrons.
Step 2
Tick (✓) two lines that are correct for an alpha particle.
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Answer
The correct choices for an alpha particle are:
is two protons and two neutrons
has a positive charge.
Step 3
Describe the ionising and penetrating abilities of alpha particles.
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Answer
Alpha particles are known for their strong ionising power. They can produce many ions or ion pairs in a short distance, typically a few centimeters.
However, alpha particles have weak penetrating abilities, being only able to travel through a few centimeters of air or being stopped by a sheet of paper.
