The formula you're referring to, E = hf, where E represents energy, h is Planck's constant, and f is frequency, is specifically associated with light waves. This formula is a fundamental relationship in quantum mechanics known as the Planck-Einstein relation.
According to quantum theory, electromagnetic waves, including light waves, exhibit particle-like behavior called photons. The energy of a single photon is given by the formula E = hf, where h is Planck's constant (approximately 6.626 × 10^-34 joule-seconds) and f is the frequency of the electromagnetic wave.
In the case of sound waves, the energy associated with them is not directly related to their frequency using the same formula. Sound waves are not quantized like light waves and do not consist of discrete particles like photons. The energy carried by a sound wave is related to its intensity, which is determined by the square of its amplitude.
So, while the formula E = hf is applicable to light waves and the energy associated with photons, it does not directly apply to sound waves.