Test Index

JAMB Physics 2019 Paper

Question : 82

Total: 100

Solution:

Concept:

Relative humidity compares the actual water vapour in the air with the amount needed for saturation at the same temperature.

Explanation:

Relative humidity is given by:

RH = \frac{\text{mass of water vapour present}}{\text{mass of water vapour required for saturation}} \times 100\%

Substitute the given values:

RH = \frac{0.05\,g}{0.15\,g} \times 100\%

Simplify the fraction:

RH = \frac{1}{3} \times 100\%

RH = 33.33\%

Answer:

The relative humidity of the air is

33.33\%

The correct option is C. 33.33%.

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