Passage III
A metal string stretched between two fixed ends will vibrate and produce a sound when it is plucked, as illustrated in Figure 1.
To investigate how sounds are produced, a student used strings constructed of either steel, aluminum, or an unknown material. String of differing lengths, radii, and materials were stretched with various tensions between fixed ends. When plucked, each of these strings produced a sound of a specific fundamental frequency (pitch). The results appear in Table 1.
13. According to Table 1, as the radius of a string is doubled, the frequency is:
Your Answer is
Correct Answer is A
Explanation
Compared with trail11, 12, or 12, 14, etc., only the observation frequency of the group whose radius has doubled, it is found that it is halved, which meets A