JSCE Mathematics 2023 Objective — Question 25
Question 25 of 80 from the Junior Secondary Certificate Examination (JSCE) Mathematics 2023 Objective paper, with the correct answer and a full explanation.
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The radius of a hydrogen atom is 0.529 x 10^-10 m and its mass is 1.67 x 10^-27 kg. Calculate its density in kg/m³. [Volume of sphere = 4/3 πr³, π = 3.142]
- A. 0.082kg/m³Correct
- B. 0.192kg/m³
- C. 0.312kg/m³
- D. 0.532kg/m³
Explanation
Volume = 4/3 x 3.142 x (0.529 x 10^-10)³, then density = mass / volume. The working gives about 2.69 x 10³, which is not among the printed options.
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