WAEC 2012 Physics · Question 39

In the formation of sea breeze. wind blows from

Options

  1. A.sky to land
  2. B.sea to sky
  3. C.land to sea
  4. D.sea to land

Answer: D. sea to land

Explanation written with AI and checked against the answer key

Analyze the question: It asks about the direction of wind in a sea breeze. The name itself is a clue: a sea breeze is a breeze coming from the sea.

Explain the concept: During the day, land heats up faster than water because land has a lower specific heat capacity. Water heats slowly and stays cooler.

Step-by-step solution:

  1. The sun heats the land faster than the sea.
  2. Air above the land gets warm, becomes less dense, and rises. This creates a region of low pressure over the land.
  3. Air above the sea stays cooler and denser, so it is a region of higher pressure.
  4. Air moves from high pressure to low pressure, so cool air from the sea blows toward the land.
  5. The warm air rising over the land moves out toward the sea at higher altitude and sinks, completing the convection cycle.

So at the surface, the wind blows from sea to land.

Checking the options:

  • A. Sky to land: wrong, this is not a horizontal surface wind.
  • B. Sea to sky: wrong, this describes rising air, not the breeze.
  • C. Land to sea: this is a land breeze, which happens at night.
  • D. Sea to land: correct.

Tip: Name the wind by where it comes from. Sea breeze comes from the sea, so it blows sea to land (daytime). Land breeze comes from the land, so it blows land to sea (night).

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