Final answer:
Louder sounds do not imply a higher or lower frequency; rather, they are characterized by greater amplitude, which is the strength or power of the wave.
The Correct option is; a) Higher frequency
Step-by-step explanation:
Louder sounds have a greater amplitude compared with softer sounds, not necessarily a higher or lower frequency. Loudness is associated with the energy of the wave, which is represented by the amplitude.
The frequency of a sound wave, which is the number of vibrations (or cycles) per second, is perceived as pitch, whether the sound is high or low.
When discussing wavelength, in a given medium, low-frequency sounds have a greater wavelength than high-frequency sounds. Therefore, the statement that louder sounds have a higher frequency is not correct; the correct property that increases with loudness is the amplitude of the wave.