Science ACT Practice

Solar cycles are periodic variations in the Sun's brightness, often associated with the number of sunspots.

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

Sound energy is the energy carried by sound waves as they travel through a medium.

The speed of sound (V_s) is the speed at which sound waves move through a medium.

The speed of sound in metals may vary with density, but it does not consistently increase with density.

The hypothesis suggests that as density (d) for metals increases, the speed of sound (V_s) for metals increases.

A higher density does not necessarily imply a higher speed of sound, as shown by the data.

The table helps analyze the relationship between density and the speed of sound in various metals.

If V_s is greater at lower densities, it contradicts the hypothesis that speed increases with density.

A hypothesis is a proposed explanation for a phenomenon, which can be tested through experiments.