Shrillness of sound is determined by

Explanation

Frequency determines the shrillness or pitch of sound. If the frequency of vibration is high, the sound is more shrill and its pitch is higher. If the frequency is low, the pitch is low. Generally, a female voice has a higher frequency and is more shrill than a male voice. It is noteworthy that frequency and wavelength are inversely proportional. Therefore, it is also true that the shrillness of sound depends on its wavelength. For example, the smaller the wavelength, the higher the frequency, and the sound becomes more shrill.