# How to explain the difference of attenuation of different pitch of sound by kinetic molecular energy?

How to explain the difference of attenuation of different pitch of sound by kinetic molecular energy ? I know that «sound of low frequencies travel farther in air than sound of high frequencies». But since the energy of low pitch is less than high pitch. So logically, the high power mean more molecular collision so more volume where sound can disperse (travel) and less power mean less collision so attenuation so fast (sound travel less volume).

• Attenuation due to viscosity (proportional to $$f^2$$). Simply put, this is higher at high frequencies because the fluid is then expanded and contracted more rapidly.
• Attenuation due to heat conduction (proportional to $$f^2$$). Simply put, this is higher at high frequencies because the sound wave peaks (warmer) and troughs (colder) are closer together, so that the heat conduction occurs faster.