WAEC Physics 2023 Objective — Question 21
Question 21 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation?
- A. most energetic molecules leave the surface and return
- B. most energetic molecules leave the surface and escape into the airCorrect
- C. least energetic molecules leave the surface and return
- D. least energetic molecules leave the surface and escape into the air
Explanation
The most energetic molecules of the liquid are able to leave the surface and escape into the air (evaporation), which is why the liquid level reduces over several days.
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