No, it is not possible to block ultraviolet (UV) waves with sound waves of the same wavelength and frequency but with a 180-degree phase difference.
UV waves and sound waves belong to different regions of the electromagnetic spectrum and propagate through different mechanisms. UV waves are a form of electromagnetic radiation, while sound waves are mechanical waves that require a medium (such as air, water, or solid) to propagate. The interaction and behavior of these waves are fundamentally different.
Sound waves cannot block or cancel out UV waves because they operate on different principles. Sound waves are longitudinal waves that propagate through the compression and rarefaction of particles in a medium, while UV waves are transverse electromagnetic waves that consist of oscillating electric and magnetic fields.
To block or shield against UV waves, specialized materials and coatings are typically used, such as UV-blocking glasses or sunscreen. These work by absorbing or reflecting the UV radiation, preventing it from reaching the skin or eyes.