Question

Assertion (A): Phenomena of dawn and dusk is experienced more in temperate regions.

Reason (R): The twilight continues as long as sun is 18° below the horizon.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R does not explain A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

• Assertion (A) is true: The phenomena of dawn and dusk (twilight) are more prominent in the temperate regions, as these areas experience more gradual transitions between day and night due to their moderate latitudes. This results in longer periods of twilight.
• Reason (R) is also true: Twilight continues as long as the Sun is 18° below the horizon. This is the definition of civil twilight, during which there is still some light before it becomes fully dark.