Question 30 Answer and Explanation _ACT April 2021 Form Z04 Science Section

30. For the range of temperatures and the range of relative humidities shown in Figures 1 and 2, respectively, is α for a 200 Hz sound wave more strongly affected by changes in temperature or by changes in relative humidity?

F. Temperature, because the maximum variation in α is about 0.5 dB/km in Figure 1 but about 2.5 dB/km in Figure 2.

G. Temperature, because the maximum variation in α is about 2.5 dB/km in Figure 1 but about 0.5 dB/km in Figure 2.

H. Relative humidity, because the maximum variation in α is about 0.5 dB/km in Figure 1 but about 2.5 dB/km in Figure 2.

J. Relative humidity, because the maximum variation in α is about 2.5 dB/km in Figure 1 but about 0.5 dB/km in Figure 2.

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Comparing the bottom line of the two Figures corresponding to 200Hz, it can be clearly seen that the fluctuation in Figure 1 is more obvious, and the maximum fluctuation can reach 2.5dB/km.