If a light wave and a sound wave have almost the same wavelength, can they therefore interfere?
Light does not really affect the sound. Sound is made of vibrations (aka rapid pressure fluctuations) in air, water, or solid material. Light is made of vibrations in the electric and magnetic fields.
They vibrate in different mediums and thus never rarely interfere. However, I should point out that sound can affect light indirectly, even if it doesn't happen the other way around. For example, sound waves can cause mirrors to vibrate insensitive optics experiments, thus messing up the data.
But directly, they don't interact.
If a light wave and a sound wave have almost the same wavelength, can they therefore interfere?
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