ACT Question for August 12th

Solar cycles are periodic variations in the Sun's brightness. The following figure shows the number of sunspots and the Sun's brightness at a particular wavelength for part of one cycle.

Based on the Figure, which of the following hypotheses best relates the number of sunspots to the Sun's brightness at the particular wavelength?

A) The number of sunspots is highest when the Sun is near its maximum brightness.

B) The number of sunspots is lowest when the Sun is near its maximum brightness.

C) The number of sunspots is highest both when the Sun is near its maximum brightness and when the Sun is near its minimum brightness.

D) The number of sunspots is lowest both when the Sun is near its maximum brightness and when the Sun is near its minimum brightness.

CORRECT

INCORRECT

The correct answer is (A).

Getting to the Answer: Use the Figure to determine the relationship between the number of sunspots and the Sun's brightness at a particular wavelength. The Figure shows that the number of sunspots tends to increase as brightness increases. So, the number of sunspots is greatest at maximum brightness and lowest at minimum brightness.

(A) Correct: this matches the analysis above; the number of sunspots is highest when the Sun is near its maximum brightness

(B) Incorrect: the number of sunspots is highest, not lowest, when the Sun is near its maximum brightness

(C) Incorrect: the number of sunspots is highest when the Sun is near its maximum brightness, not near both its maximum and minimum brightness

(D) Incorrect: the number of sunspots is lowest when the Sun is near its minimum brightness, not near both its maximum and minimum brightness

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ACT Question for August 12th

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